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A man can swim 3 km/hr. in still water. If the velocity of the stream is 2 km/hr., the time taken by him to swim to a place 10 km upstream and back is :
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9 1 hrs 3 - 10 hr.
- 12 hr.
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8 1 hrs 3
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Correct Option: C
Here , Speed of man = 3 kmph
Velocity ( speed ) of the stream = 2 km/hr
Rate downstream = 3 + 2 = 5 kmph
Rate upstream = 3 - 2 = 1 kmph
| ∴ Required time = | + | |||
| Rate downstream | Rate upstream |
| Required time = | + | = 12hours | ||
| 5 | 1 |
