A motorboat travels 10km downstream in 50minutes and returns in 1hour. What is the speed of the motorboat in still water?
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Step-by-step explanation:
speed = distance/time
D = 10*60/50 = 12km/hr
U = 10/60 = 1/6 km/hr
U : D
S 1/6 12
speed of motor boat = U+D/2
= (1/6+12)/2
= 73/6*2
= 6.08km/hr
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