1.

A train 120m long is running at a speed of 40kmph. A man is coming at speed of 5 kmph from the opposite direction. How long will the train take to pass the man?1). 4.5 sec2). 5.7 sec3). 9.6 sec4). 6.7 sec

Answer»

Distance = Speed × Time ⇒ Time = Distance/Speed

If two trains are going toward each other their relative speed = Sum of their speed

Here, the train and the man is RUNNING towards each other. So, the relative speed will be

= (40 + 5) kmph = 45 kmph.

= 45 × (1000/3600) m/SEC

= (25/2) m/s

The length of the train = 120m

∴ The REQUIRED time to PASS the man = 120/(25/2) = 120 × (2/25) = 9.6 sec.


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