The boat whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes.The speed of the stream (in km/hr) is:
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4 hours 30 min. = 4.5 hours
let the speed of motor boat = 15 km/hr
speed downstream = (15+x) km/hr
speed upstream = (15-x) km/hr
so, [30/(15+x)] + [30/(15-x)] = 4.5
900/(225-x^2) = 9/2
x^2 = 25
x = 5 km/hr
i hope it will help you
regards
let the speed of motor boat = 15 km/hr
speed downstream = (15+x) km/hr
speed upstream = (15-x) km/hr
so, [30/(15+x)] + [30/(15-x)] = 4.5
900/(225-x^2) = 9/2
x^2 = 25
x = 5 km/hr
i hope it will help you
regards
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