A motor-boat whose speed is 15km/hr in still water goes 30km down-stre – InterviewSolution

1.	A motor-boat whose speed is 15km/hr in still water goes 30km down-streamand come back is a total time of 4 hours 30mins. Find the speed of the stream.
Answer» Let the speed of stream be x km/hSpeed downstream= (15+x)km/hSpeed upstream= (15-x)km/hTherefore, 30/15+x + 30/15-x =4½900/225-x²=9/29x²=225x²=25x= 5km/hr

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