Question

speed of Boat in still water is 11 km/hour.It can go 12 km upstream and 22 domstream to original point in 2 hours 45 minutes.Find speed of stream.

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Answer 1

Let the speed of stream be x

Speed of boat in still water = 11

Speed of boat upstream = 11-x

Speed of boat downstream = 11+x

Distance = 12

Distance/speed = time

12/(11-x) + 12/(11+x) = 2 hours 45min

12*(22/(121-x^2) = 11/4

x^2 = 25

x = 5

Speed of stream = 5km/hr

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