Question

11. A 210 m long train is moving due North at a speed
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
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Answer 1

Answer:

EXPLANATION

the speed of train =25m/s

the speed of bird =5m/s

so the speed by which bird cross the train=25-5

=5m/s

so the time taken by the bird to cross the train

By distance formula

speed =distance/time

time =distance /speed

so, time =210/20

=10.5 s

10.5 second in required answer

if satisfied please mark as brainleast

Answer 2

Answer:

Explanation:

The relative speed of bird with respect to the train is = 5+25 m/s = 30 m/s

now, time take will be

speed=distance/time

time=distance/speed  

210/30 = 7 sec.