Boats and Streams

Quantitative Aptitude (SBI-CL)

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A motorboat, whose speed is 15 km/hour 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/hour) is

Explanation:

Let the speed of the stream be x km/hr. Then,

Speed downstream = (15 + x) km/hr,

Speed upstream = (15 - x) km/hr.

	30/	+	30/	= 4	1
	(15 + x)		(15 - x)		2

	900/	=	9/
	225 - x²		2

9x² = 225

x² = 25

x = 5 km/hr

Hence, option 2 is the correct answer.

By: Amit Kumar

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