The distance between two cities is 30 km. If two persons A and B travel in the opposite directions starting fromthe two cities, they meet after 2 hours. If they start from the same city and travel in same direction they meet after 3 hours. If A is faster than B the speed of A is

A

10 kmph

B

$$12\frac{1}{2}$$ kmph

C

15 kmph

D

$$16\frac{1}{2}$$ kmph