When the speed of a boat in still water is 4 km/h and the rate of stream is 2 km/h, find upstream speed of the boat. ?

When the speed of a boat in still water is 4 km/h and the rate of stre

1.	When the speed of a boat in still water is 4 km/h and the rate of stream is 2 km/h, find upstream speed of the boat. ?
A.	6 km/h
B.	5 km/h
C.	2 km/h
D.	7 km/h
Answer» D. 7 km/h

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