Question
Download Solution PDFTo go a distance of 144 km upstream, a rower takes 12 hours while it takes her only 9 hours to row the same distance downstream. What is the speed of the stream?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Total distance = 144 km
Time taken by rower to go upstream = 12 hours
Time taken by rower to go downstream = 9 hours
Concept used:
Upstream speed = (U - V)
Downstream speed = (U + V)
Speed of stream = (Downstream - Upstream)/2
Speed = distance/time
Calculation:
Upstream speed of rover = (U - V) = 144/12 = 12 km/h
Downstream speed of rover = (U + V) = 144/9 = 16 km/h
Speed of stream = (16 - 12)/2 = 4/2 = 2 km/h
∴ The correct answer is 2 km/h.
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