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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