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Question

A train of 150 m length is going towards North direction at a speed of 10ms-1. A parrot flies at a speed of 5ms-1 towards South direction parallel to the railway track. The time taken by the parrot to cross the train is equal to


A

12s

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B

8s

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C

15s

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D

10s

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E

5s

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Solution

The correct option is D

10s


Step1: Given data and assumptions.

Length of the train, l=150m

Speed of the train, vt=10ms-1

Speed of the parrot, vb=5ms-1

Step2: Find the time taken by the parrot to cross the train.

We have

From the figure the relative velocity of the parrot with respect to the train,

vr=vt-vb

Where vr is the relative velocity.

vr=10--5

vr=15ms

Now,

The time taken by the parrot to cross the train=lvr =15015=10s

Hence, option D is correct.


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