Question 68

Down stream speed of boat is 14 km/h. Upstream speed of boat is 10 km/h. In how muchtime can it cover 72 km in still water?

Solution

Downstream speed = 14 km/hr

Upstream speed = 10 km/hr

Speed in still water = $$\frac{Downstream speed + Upstream speed}{2}$$ = $$\frac{14 + 10}{2}$$ = 12km/hr

A/c to question,

Required speed =$$\frac{72}{12}$$ = 6 hours

So, the answer would be option b) 6 hours

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