Down stream speed of boat is 14 km/h. Upstream speed of boat is 10 km/h. In how much time can it cover 72 km in still water?
Answer & explanation
Correct answer: option 2
We know that,
Time = \(\frac{Distance}{Speed}\)
Speed of the boat in still water = (Downstream speed of boat + Upstream speed of boat) $\div$ 2
= Speed of the boat in still water = \(\frac{14 + 10}{2}\)= 12 km/h
= Time = \(\frac{72}{12}\) = 6 hours