Question

To cross the river in shortest distance, a swimmer should swim making angle $\theta$ with the upstream. What is the ratio of the time taken to swim across in the shortest time to that in swimming across over shortest distance. [Assume speed of swimmer in still water is greater than the speed of river flow]

• A. $\cos \theta$
• B. $\sin \theta$
• C. $\tan \theta$
• D. $\cot \theta$

Answer 1

The correct option is B $\sin \theta$

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