Ravish travelled the first 20 km of an entire distance at a speed of 12 km/h; the next 25 km at a speed of 10 km/h and the remaining distance at a speed of 15 km/h. If his overall average speed was 13.5 km/h, what was the distance that Ravish travelled at a speed of 15 km/h?

A

113.95km

B

110.95 km

C

112.5 km

D

111.95 km