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A boat can travel with a speed of 13 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.

2 hours
3 hours
4 hours
5 hours

Correct Answer: 4 hours

Explanation:

Speed downstream = (13 + 4) km/hr = 17 km/hr.

Time taken to travel 68 km downstream =	❨	68	❩hrs = 4 hrs.
		17

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