A train runs at a speed of 90 km/h in the first 10 minutes and 60 km/h in next 25 minutes and 15 km/h in last 4 minutes. What is the average speed of the train?

A

$$51\frac{1}{11}$$

B

$$61\frac{11}{13}$$

C

$$63\frac{1}{13}$$

D

$$65\frac{5}{13}$$