The speed of boat upstream and speed of boat downstream are 7 km/h and 13 km/h, respectively. Then the speed of stream and the speed of boat in still water is ?

The speed of boat upstream and speed of boat downstream are 7 km/h and

1.	The speed of boat upstream and speed of boat downstream are 7 km/h and 13 km/h, respectively. Then the speed of stream and the speed of boat in still water is ?
A.	10 km/h and 3 km/h
B.	15 km/h and 9 km/h
C.	20 km/h and 6 km/h
D.	40 km/h and 12 km/h
Answer» B. 15 km/h and 9 km/h

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