The respective ratio between the speed of a bike, car, and a cycle is 5 : 9 : 4. The average speed of the bike, car, and cycle is 36 km/h together. Find the average speed of the bike and the car together.
1
40 km/h
2
42 km/h
3
45 km/h
4
43 km/h
5
44 km/h