Speed Time and Distance MCQ Quiz - Objective Question with Answer for Speed Time and Distance - Download Free PDF

Calculation

Speed of boat:stream = 7:2 ⇒ Let boat = 7x, stream = 2x
Upstream = 7x − 2x = 5x
Downstream = 7x + 2x = 9x

Upstream: 120 km in 8 hours ⇒ 15 km/hr ⇒ 5x = 15 ⇒ x = 3
Downstream speed = 9x = 27 km/hr
In 3 hrs: Distance = 27 × 3 = 81 km

Given:

Speed of the boat in still water = 13 km/hr

Speed of the stream = 4 km/hr

Distance to be travelled downstream = 51 km

Formula Used:

Downstream speed = Speed of the boat in still water + Speed of the stream

Time taken = Distance / Speed

Calculation:

Downstream speed = 13 + 4

Downstream speed = 17 km/hr

Time taken = 51 / 17

Time taken = 3 hours

The time taken by the boat to travel 51 km downstream is 3 hours.

Given:

Speed of the car = 80 km/hr

Time taken to complete the journey = 9 hours

Speed of the car for the same distance = 60 km/hr

Formula Used:

Distance = Speed × Time

Time = Distance / Speed

Calculation:

Distance travelled = 80 km/hr × 9 hrs

Distance travelled = 720 km

Time required to travel 720 km at 60 km/hr

⇒ Time = 720 km / 60 km/hr

⇒ Time = 12 hours

The correct answer is option 3.

Explanation:

Distance traveled by the first car in 1 1/2 hours

= Distance traveled by the third car in 1/2 hour ... (ii)

The third car covers 30 km in 1/2 hour.

∴ Speed of the third car = 60 km/h.

Using (i), the second car covers 60 km in 1 1/2 hours.

∴ Speed of the second car = 60 / 1.5 = 40 km/h.

Using (ii), the first car covers 30 km in 1 1/2 hours.

∴ Speed of the first car = 30 / 1.5 = 20 km/h.

Relative speed of the second car = 40 - 20 = 20 km/h.

Therefore, the required answer is 20.

Given:

The speed of the boat to the speed of the stream is in the ratio 7 : 2.

The boat covers a certain distance downstream in 1 hour.

Let the speed of the boat be 7x and the speed of the stream be 2x.

Calculation:

The effective speed of the boat downstream is the sum of the boat's speed and the stream's speed:

Speed downstream = 7x + 2x = 9x

It is given that the boat covers a certain distance downstream in 1 hour. So, the distance covered downstream is:

Distance = Speed × Time = 9x × 1 = 9x

Now, to cover the same distance upstream, the effective speed of the boat is the difference between the boat's speed and the stream's speed:

Speed upstream = 7x - 2x = 5x

The time taken to cover the same distance upstream is:

Time = Distance / Speed = 9x / 5x = 9 / 5 hours

Converting the time to minutes (since 1 hour = 60 minutes):

Time in minutes = (9 / 5) × 60 = 108 minutes

∴ The time taken by the boat to cover the same distance upstream is 108 minutes.

Given

Length of first train (L1) = 400 m

Length of second train (L2) = 300 m

Speed of second train (S2) = 60 km/hr

Time taken to cross each other (T) = 15 s

Concept:

Relative speed when two objects move in opposite directions is the sum of their speeds.

Calculations:

Let the speed of the first train = x km/hr

Total length = 300 + 400

Time = 15 sec

According to the question:

700/15 = (60 + x) × 5/18

28 × 6 = 60 + x

x = 108 km/hr.

Therefore, the speed of the longer train is 108 km per hour.

Given:

Speed is 60 km per hour,

Train passed through a 1.5 km long tunnel in two minutes

Formula used:

Distance = Speed × Time

Calculation:

Let the length of the train be L

According to the question,

Total distance = 1500 m + L

Speed = 60(5/18)

⇒ 50/3 m/sec

Time = 2 × 60 = 120 sec

⇒ 1500 + L = (50/3)× 120

⇒ L = 2000 - 1500

⇒ L = 500 m

∴ The length of the train is 500 m.

Given:

Total track length = 1200 m

Speed of A = 2 m/s ; speed of B = 4 m/s

Speed of C = 6 m/s

Formula used:

Distance = relative speed × time

Calculation:

Relative speed of A and B = (4 - 2) = 2 m/s

Relative speed of B and C = (6 + 4) = 10 m/s

Relative speed of A and C = (6 + 2) = 8 m/s

Time taken by A and B = 1200/2 = 600 sec

Time taken by B and C = 1200/10 = 120 sec

Time taken by A and C  = 1200/8 = 150 sec

A, B and C will meet at = L.C.M {600,120, 150} = 600 sec = 600/60 = 10 minutes

∴ The correct answer is 10 minutes.

Given:

A man travels from A to B at a speed of 36 km/hr in 74 minutes and he travels a distance from B to C with a speed of 45 km/hr in 111 minutes. 

Formula used:

Average speed = Total distance/Total time taken

Calculation:

Time taken = 74 min : 111 min   [given]

Ratio of Time taken = 2 : 3

Average Speed = \(\frac{{36\ \times\ 2\ +\ 45\ \times\ 3}}{{2\ +\ 3}}\)

Average Speed = 207/5

Average Speed = 41.4 km/hr

∴ The average speed of whole journey is 41.4 km/h

Given:

In a 1500 m race, Anil beats Bakul by 150 m and in the same race Bakul beats Charles by 75 m.

Concept used:

Time × Speed = Distance

Calculation:

According to the question,

Anil goes 1500m while Bakul goes (1500 - 150) i.e. 1350m.

Ratio of speed of Anil and Bakul = 1500 : 1350 = 10 : 9 = 200 : 180

According to the question,

Bakul goes 1500m while Charlie goes (1500 - 75) i.e. 1425m.

Ratio of speed of Bakul and Charlie = 1500 : 1425 = 20 : 19 = 180 : 171

So, the ratio of the speeds of Anil, Bakul and Charlie = 200 : 180 : 171

Let the speeds of Anil, Bakul and Charlie be 200k, 180k and 171k m/s respectively.

Time taken by Anil to finish the race = 1500/200k = 7.5/k seconds

Now, Anil beats Charlie by = (200 - 171)k ×7.5/k = 217.5m

∴ Anil beat Charlie by 217.5m.

Shortcut Trick

In a 1500 m race, Anil beats Bakul by 150 m

When Anil completes the race, Bakul covered (1500 - 150) = 1350 m

In a 1500 m race Charles is 75 m behind Bakul

So, in 1350 m race Charles is 75/1500 × 1350 = 67.5 m behind Bakul

So, Charles is (67.5 + 150) = 217.5 m behind from Anil in 1500 m race

∴ Anil beat Charlie by 217.5m.

Concept used:

Speed × time = distance

Calculation:

In the 1^st 20 min the thief cover distance = 4 m,

20 min in hour = 20/60 hour

Let's assume that the speed of security guard = x m/hr, where x > 12

According to the question,

⇒ (x - 12) × 20/60 = 4

⇒ x - 12 = 12

⇒ x = 24

∴ The correct answer is 24 m/h

Given:

Geeta runs 5/2 times as fast as Babita 

Geeta gives a lead of 40 m to Babita 

Formula Used:

Distance = Speed × Time 

Calculation:

Let the speed of Babita be 2x

⇒ Speed of Geeta = (5/2) × 2x = 5x

Let the distance covered by Geeta be y meters

⇒ Distance covered by Babita = (y - 40) meters

As time is constant, distance is directly proportional to speed 

⇒ \(\frac{2x}{5x}\) = \(\frac{y-40}{y}\)

⇒ 2y = 5y - 200 

⇒ y = 200/3 = 66.67m 

∴ The distance from the starting point where both of them will meet is 66.67 m

Concept used:

If upstream speed = U and downstream speed = D, then speed of boat = (U + D)/2

Calculation:

According to the question,

20/U + 44/D = 8  … (i)

15/U + 22/D = 5  … (ii)

Multiply by 2 the equation (ii) then subtract from 1 we get

20/U + 44/D = 8

30/U + 44/D = 10

- 10/U = - 2

⇒ U = 5 km/hr

Putting the value in equation (i), we get D = 11

So, the speed of boat = (U + D)/2 = (5 + 11)/2 = 8 km/hr

∴ The correct answer is 8 km/hr

Given:-

Train₁= 152.5m

Train₂= 157.5m

Time = 9.3 sec

Calculation:-

⇒ Total distance to be covered = total length of both the trains

= 152. 5 + 157.5

= 310 m

Total time taken = 9.3 sec

Speed = distance/time

= (310/9.3) m/sec

= (310/9.3) × (18/5)

= 120 km/hr

∴ The combined speed of the two trains every hour would then be 120 km/hr.

Alternate Method When two trains are moving in opposite direction-

Let the speed of ine is 'v' and the second is 'u'

∴ Combined speed = v + u

Total distance = 152.5 + 157.5

= 310 m

∴ Combined speed = Total distance/total time

⇒ (v + u) = 310/9.3

⇒ (v + u) = 33.33 m/s

⇒ (v + u) = 33.33 × (18/5)

⇒ (v + u) = 120 km/hr

Given,

Sathish completes 900 m race.

Kiran covers = 900 – 270 = 630 m

Rahul covers = 900 – 340 = 560 m

⇒ Ratio of their speed = 630/560

When Kiran covers 900 m race  then

⇒ Rahul would cover = 900 × 560/630 = 800 m