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If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is :
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- 2 hours
- 3 hours
- 4 hours
- 7 hours
- 2 hours
Correct Option: C
Here , speed of a boat in still water = 20 km/hr and the speed of the current = 5 km/hr
Distance = 100 km
Rate downstream of boat = (20 + 5) kmph = 25 kmph
| Required time = | ||
| Rate downstream of boat |
| Required time = | = 4 kmph | |
| 25 |
