Question

the speed of a boat in still water is 11km/h it can go 12km upstream and return downstream to original point in 2h 45min. find the speed of stream​

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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