A swimmer can swim in still water with speed $v$ and the river is flowing with velocity $v/2$. To cross the river in shortest distance, he should swim making angle $\theta$ with the upstream. What is the ratio of the time taken to swim across the shortest time to that is swimming across over shortest distance
A swimmer can swim in still water with speed $v$ and the river is flowing with velocity $v/2$. To cross the river in shortest distance, he should swim making angle $\theta$ with the upstream. What is the ratio of the time taken to swim across the shortest time to that is swimming across over shortest distance
- A
$cos \,\theta$
- B
$sin \,\theta$
- C
$tan\,\theta$
- D
$cot \,\theta$
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