A boat can go at a speed of 13 km/hr in still water. On the off chance that the speed of the stream is 4 km/hr, discover the time taken by the vessel to go 68 km downstream. A) 2 HOURS B) 3 HOURS C) 4 HOURS D) 5 HOURS

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A boat can go at a speed of 13 km/hr in still water. On the off chance that the speed of the stream is 4 km/hr, discover the time taken by the vessel to go 68 km downstream.

A) 2 HOURS
B) 3 HOURS
C) 4 HOURS
D) 5 HOURS

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Answer: C
Solution:
Speed downstream = (13 + 4) km/hr = 17 km/hr. Time taken to movement 68 km downstream = (68/17) hrs = 4 hrs