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