1.

A motorboat, 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:

Answer» 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. Video Explanation: https://youtu.be/lMFnNB3YQOo


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