A boat takes 9 h to travel a distance upstream and taken 3 h to travel the same distance downstream. If the speed of the boat in still water is 4 km/h, then what is the velocity of the stream ?

A boat takes 9 h to travel a distance upstream and taken 3 h to travel

1.	A boat takes 9 h to travel a distance upstream and taken 3 h to travel the same distance downstream. If the speed of the boat in still water is 4 km/h, then what is the velocity of the stream ?
A.	4 km/h
B.	3 km/h
C.	6 km/h
D.	2 km/h
Answer» E.

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