Two cyclists start from the same place in opposite directions. One goes towards north at a speed of 14 km/h and the other goes towards south at a speed of 24 km/h. What time will they take to be 47.5 km apart?

A

$$1\frac{1}{4}$$ h

B

$$1\frac{2}{3}$$ h

C

$$1\frac{1}{3}$$ h

D

1 h