A train of 150 m length is going toward north direction at a speed of 10 m s-1. A parrot flies at a speed of 5 m s-1 toward south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
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a
12 s
b
8 s
c
15 s
d
10 s
answer is D.
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Detailed Solution
Relative velocity of third bird with respect to train is VBT=VB+VT=5+10=15ms−1[Because they are going in opposite directions]Time taken by the bird to cross the train is 1505=10s
A train of 150 m length is going toward north direction at a speed of 10 m s-1. A parrot flies at a speed of 5 m s-1 toward south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to