A man can row a boat at a speed of 20 km/hr in still water. If the speed of the stream is 5 km/hr, in what time in hours he can row a distance of 75 km downstream?
Answer & explanation
Correct answer: option 1
Given:
- Speed in still water = 20 km/hr
- Speed of stream = 5 km/hr
- Distance downstream = 75 km
Downstream speed:
$20 + 5 = 25\text{ km/hr}$
Time taken:
$\text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{75}{25} = 3\text{ hours}$