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A man can row at 8 km per hour in still water. If it takes him thrice as long to row upstream, as to row downstream, then find the stream velocity in km per hour.
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- 4 Km/hr
- 5 Km/hr
- 8 Km/hr
- 14 Km/hr
Correct Option: A
Speed of man = 8;
Left distance = d
Time taken = 8/d
Upstream: Speed of stream = s
⇒ speed upstream = S’ = (8 – s)
| t' = |  |  | ||
| 8 - s |
Downstream:
| Given speed downstream = t" = | ||
| 8 + s |
⇒ 3t' = t"
| ⇒ | = | |||
| 8 - s | 8 + s |
⇒ s = 4 Km/hr
