Kinematics Question 331
Question: A boat crosses a river with a velocity of 8 km/h. If the resulting velocity of boat it’s 10 km/h then the velocity of river water is [CPMT 2001]
Options:
A) 16 sec
B) 12 sec
C) 10 sec
D) 8 sec
Correct Answer: D Relative velocity $ =10+5=15m/s $ . Time taken by the bird to cross the train $ =\frac{120}{15}=8\sec $
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