A takes 30 minutes more than B to cover a distance of 15 km at a certain speed. But if A doubles his speed, he takes one hour less than B to cover the same distance. What is the speed (in km/h) of B?

A takes 30 minutes more than B to cover a distance of 15 km at a certa

1.	A takes 30 minutes more than B to cover a distance of 15 km at a certain speed. But if A doubles his speed, he takes one hour less than B to cover the same distance. What is the speed (in km/h) of B?
A.	5
B.	\(6\frac{1}{2}\)
C.	6
D.	\(5\frac{1}{2}\)
Answer» D. \(5\frac{1}{2}\)

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A takes 30 minutes more than B to cover a distance of 15 km at a certain speed. But if A doubles his speed, he takes one hour less than B to cover the same distance. What is the speed (in km/h) of B?

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