A boat takes 4 hours to travel from a place X to Y downstream and back from Y to X upstream. If the distance from X to Y is 10.5 km, and the speed of the current is 9 km/h, then the speed of the boat in still water, in km/h, is:

A boat takes 4 hours to travel from a place X to Y downstream and back

1.	A boat takes 4 hours to travel from a place X to Y downstream and back from Y to X upstream. If the distance from X to Y is 10.5 km, and the speed of the current is 9 km/h, then the speed of the boat in still water, in km/h, is:
A.	\(10\frac{1}{2}\)
B.	15
C.	12
D.	\(12\frac{1}{2}\)
Answer» D. \(12\frac{1}{2}\)

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A boat takes 4 hours to travel from a place X to Y downstream and back from Y to X upstream. If the distance from X to Y is 10.5 km, and the speed of the current is 9 km/h, then the speed of the boat in still water, in km/h, is:

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