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A man can row 15km/ hr downstream and 9 km/hr upstream. The speed of the boat in still water is
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- 8 km/hr.
- 10 km/hr.
- 15 km/hr.
- 12 km/ hr
- 8 km/hr.
Correct Option: D
Given that , Rate downstream = 15 kmph
Rate upstream = 9 kmph
We know that ,
| Speed of boat in still water = | (Rate downstream + Rate upstream) = | (15 + 9) | ||
| 2 | 2 |
| Speed of boat in still water = | × 24 = 12 kmph | |
| 2 |
