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A boat can travel with a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

4 hr
4.25 hr
4.5 hr
6 hr
Explanation:

speed of boat in still water = 12 km/hr

speed of the stream = 4 km/hr

Speed downstream = (12+4) = 16 km/hr

Time taken to travel 68 km downstream $=\dfrac{68}{16}=\dfrac{17}{4}$ = 4.25 hours

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