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 .

A 4 hours
B 3 hours
C 5 hours
D 2 hours

Correct Answer: 4 hours

Speed downstream = (13 + 4) km/hr = 17 km/hr Time taken to travel 68 km downstream = 68/17 hours = 4 hours
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