A takes 2 hours more than B to cover a distance of 40 km. If A doubles his speed, he takes $$1\frac{1}{2}$$ hour more than B to cover 80 km. To cover a distance of 120 km, how much time(in hours) will B take travelling at his same speed?

A

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

B

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

C

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

D

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