If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is :

If a boat goes 7 km upstream in 42 minutes and the speed of the str

1.	If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is :
A.	4.2 km/hr
B.	9 km/hr
C.	13 km/hr
D.	21 km/hr
Answer» D. 21 km/hr

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If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is :

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