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A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream ?
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- 4.5 km/h
- 4 km/h
- 9 km/h
- 5.6 km/h
- 4.5 km/h
Correct Option: A
Suppose Speed in still water = p km/h
Speed of current = q km/h
| ∴ p + q = | ||||
| 60 | ||||
p + q = 15
| p - q = | ||||
| 60 | ||||
p - q = 6
| Speed of current = | [(p + q) - (p - q)] | |
| 2 |
| Speed of current = | (15 - 6) = | = 4.5 kmph | ||
| 2 | 2 |
