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A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is
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- 2 : 1
- 1 : 2
- 4 : 3
- 3 : 1
- 2 : 1
Correct Option: D
Suppose Speed of boat in still water = p kmph
Speed of current = q kmph
Rate downstream = (p + q) kmph
Rate upstream = (p – q) kmph
Distance = Speed × Time
∴ (p – q) × 2t = (p + q) × t
⇒ 2p – 2q = p + q
⇒ 2p – q = 2q + q
⇒ p = 3q
| ⇒ | = | = 3 : 1 | ||
| q | 1 |
