Gopal travels from A to B at the speed of 5km/h, from B to C at 10 km/h, and from C to D at 15 km/h. If AB = BC = CD, then find Gopal’s average speed.

A

$$8\frac{2}{11}$$ km/h

B

$$70\frac{2}{11}$$ km/h

C

$$60\frac{2}{11}$$ km/h

D

$$9\frac{2}{11}$$ km/h