Question

4. A train 270 m long is moving at a speed of 25 kmph it will cross a man coming from the
opposite direction at a speed of 2 kmph in
(A) 36 sec
(B) 32 sec
(C) 28 sec
(D) 24 sec​

Answer 1

Answer: b)36 seconds

Step-by-step explanation:

The relative speed of the train is 25+2=27km/h.

We will convert this to m/sec because the distance is in metres.

27×1000/3600 = 15/2 m/sec.

Time = d/s

Time = 270÷(15/2).

Time = 270×2/15.

Time = 36 seconds.

Answer 2

Answer:

36 seconds

Step-by-step explanation:

The relative speed of the train will be the sum of the speeds of the train and the man.

We will add them because they are moving in the opposite direction.

The relative speed of the train is 25+2=27km/h.

We will convert this to m/sec because the distance is in metres.

27×1000/3600 = 15/2 m/sec.

Time is equal to distance upon speed.

Time = 270÷(15/2).

Time = 270×2/15.

Time = 36 seconds.

The train will take 36 seconds to cross the man.

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