A motorboat whose speed is 15 km/hr on 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 motorboat whose speed is 15 km/hr on still water goes 30 km downs

1.	A motorboat whose speed is 15 km/hr on 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.	4
B.	5
C.	6
D.	10
Answer» C. 6

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A motorboat whose speed is 15 km/hr on 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 :

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