A motorboat, whose speed in 15 km/hr in still water goes 30 km downstr – McqOptions

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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:
A.	10
B.	6
C.	5
D.	4
Answer» D. 4

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