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?
1
\(51{1 \over11}\) km/h
2
\(61{11 \over13}\) km/h
3
\(63{1 \over13}\) km/h
4
\(65{5 \over13}\) km/h