A motorboat whose speed is 15 km/hr in still water goes 30km downstrea – McqOptions

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1.	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 ?
A.	5 km/hr
B.	4.5 km/hr
C.	6 km/hr
D.	7 km/hr
Answer» B. 4.5 km/hr

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