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The speed of a motor-boat is that of the current of water as 36 : 5. The boat goes along with the current in 5 hours 10 minutes. It will come back in
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- 5 hours 50 minutes
- 6 hours
- 6 hours 50 minutes
- 12 hours 10 minutes
Correct Option: C
Let the speed of motor-boat be 36k kmph and and
Speed of current = 5k kmph The boat goes along with the current in 5 hours 10 minutes i.e. 31/6 hours.
As we know that , Distance = Time × Total speed
| Distance = | × (36k + 5k) | |
| 6 |
| Distance = | km | |
| 6 |
Rate upstream = 36k – 5k = 31k kmph
| ∴ Time taken = | 41k × | |||
| 6 | ||||
| 31k | ||||
| Time taken = | hours or 6 hours 50 minutes | |
| 6 |
