Question

A 180 metre long train is moving due north at a speed of 25 m/s. A
small bird is flying due south, a little above the train, with a speed of
5 m/s. The time taken by the bird to cross the train is​

Answer 1

Answer:

6 seconds.

Explanation:

Given,

• Speed of a train due to north 25m/s
• Speed of the flying due to south 5m/s

Here, both the bodies are moving towards each other.

So, the relative speed is -

= sum of thier speed

= 25 + 5

= 30m/s

Now, time taken by the bird to cross the the train is given by :-

= distance/speed

Where, the distance will be the length of the train i.e., 180metres and speed is 30m/s

So,

= 180/30

= 6 seconds

Hence, the time taken by the bird to cross the train is 6 seconds.

_____________________

Relative speed :- When two bodies moves towards each other then, the relative speed is sum of thier speeds.

Formula used :

• Speed = Distance/Time

Answer 2

Answer:

6 seconds

Explanation:

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