A car travels a distance of 75 km at the speed of 25 km/hr. It covers the next 25 km of its journey at the speed of 5 km/hr and the last 50 km of its journey at the speed of 25 km/hr. What is the average speed of the car ?
1
40 km/hr
2
25 km/hr
3
15 km/hr
4
12.5 km/hr