Question

A 210 meter long train is moving due north at a of 25m/s. A small bird is flying due south a little above the train with speed 5m/s. The time taken by the bird to cross the train is

Answer 1

Answer:

The time taken by the bird to cross the train of the given length will be 7 seconds.

Step-by-step explanation:

Time taken by the bird to cross the train= Distance/Relative speed

Distance = 210 m

Relative speed= Speed of train + Speed of bird = 30 m/s ( addition because both are going in opposite directions)

Time for crossing the train= 210/ 30 = 7 seconds.

Answer 2

Answer:

The time taken by the bird to cross the train of the given length will be 7 seconds.

Step-by-step explanation:

Time taken by the bird to cross the train= Distance/Relative speed

Distance = 210 m

Relative speed= Speed of train + Speed of bird = 30 m/s ( addition because both are going in opposite directions)

Time for crossing the train= 210/ 30 = 7 seconds.