A motorboat can travel in still water at the speed 15 km/h, while the speed of the current is 3 km/h. Time taken by boat to go 36 km upstream is :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 3 hr
Speed upstream = Speed in still water - Speed of current
$=15-3$
$=12km/hr$
$\text{Time} = \frac{\text{Distance}}{\text{Speed}}=\frac{36}{12}=3\,\text{hours}$