Question
Download Solution PDFA 320 m long train completely crosses a 240 m long train, coming from the opposite direction, in y seconds. If the first train is travelling at the speed of 44 km/h and the second train is travelling at 56.8 km/h, then what is the value of y?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
A 320 m long train completely crosses a 240 m long train.
Speed of first train = 44 km/h.
Speed of second train = 56.8km/h
Formula Used:
Relative Speed = Speed1 + Speed2
Time (y) = Total Distance / Relative Speed
Calculation:
Speed1 = 44 km/h = 44 × 1000 / 3600 m/s = 12.22 m/s
Speed2 = 56.8 km/h = 56.8 × 1000 / 3600 m/s = 15.78 m/s
Relative Speed = 12.22 + 15.78 = 28 m/s
Total Distance = 320 + 240 = 560 m
⇒ y = 560 / 28
⇒ y = 20 seconds
∴ The correct answer is option (4).
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