A 210 meter long train is moving due north at a of 25 m/s. a small bird is flying due south a little above the train with speed 5 m/s. The time taken
A 210 meter long train is moving due north at a of 25 m/s. a small bird is flying due south a little above the train with speed 5 m/s. The time taken by the bird to cross the train is
A. 6s
B. 7s
C. 9s
D. 10s
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Correct Answer - B
Relative velocity of the bird `=25-(-5)`
`=30 m//s`
Distance =210m
`therefore=("Distance")/("velocity")=(210)/(30)=7` sec
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