In covering a certain distance. the speeds of A and B are inthe ratio 3:4. If A arrives at the destination 20 minutes later than B. the time (in hours) taken by A to arrive at the destinationis

A

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

B

$$2\frac{1}{2}$$

C

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

D

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