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.	2 km/hr
B.	3 km/hr
C.	4 km/hr
D.	5 km/hr
Answer» E.

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