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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,

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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. 

a) 2 hrs 

b) 3 hrs 

c) 4 hrs 

d) 5 hrs

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1 Answer

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Best answer

Correct option: c) 4 hrs

Explanation: 

Speed downstream=(13+4) kmph =17 kmph

Time taken to travel 68 km downstream = (68/17) hrs = 4 hrs

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