A 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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speed of boat =15 kmph
speed of stream =t x kmph
time=distance/speed
30/15+x+30/15-x=4 1/2 hrs
x=5√5 kmph
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