Question 37

A boat takes 12 hours to go downstream and 24 hours to return while covering a certain distance. What is the time taken by the boat to cover the same distance in still water?

Solution

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if t1 and t2 are the upstream and downstream times. Then time taken in still water is given by 

$$ \frac{2 \times t1 \times t2}{t1 + t2} = \frac{2 \times 12 \times 24}{36} = 16hrs $$

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