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ICSE Class 9 Answered

A train of 150 m length going towards north at Speed of 36 km/hr. A bird flying at speed 18km/hr and parallel to track towards south. Find the time taken by birds to cross the train.
Asked by adv.mukulsrivastava | 12 May, 2019, 08:54: AM
answered-by-expert Expert Answer
Bird and trains are moving in opposite direction.
speed of train = 36 kmph = 36×(5/18) = 10 m/s
flying speed of bird = 18 kmph = 18×(5/18) = 5 m/s
 
relative speed of train with respect to flying bird = (10+5) = 15 m/s
 
time taken to cross the train = 150 / 15 = 10 s
Answered by Thiyagarajan K | 12 May, 2019, 09:09: AM

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