Question

A motorboat whose speed is 15 km/hr in still water goes 30km downstream and comes back in four and a half hours. the speed of the stream is:

Answer 1

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Answer 2

Answer:

(30/15 - x) + ( 30/15+x) = 4whole1/2 = 9/2

30 ( (15+x) + ( 15 - x)/ 15^2 - x^2) = 9/2

600/3 = 225 - x^2

x^2 = 225 - 600/3 = 675-600/3 = 75/3 = 25

x^2 = 25

x = 5km/hr

Explanation: