Ramesh goes to his office by scooter at the speed of 45 km/hr and reaches 10 minutes earlier. If he goes at the speed 30 km/hr, then he reaches 10 minutes late. What will be the speed of the scooter to reach on the usual time?
1
20 km/hr
2
30 km/hr
3
45 km/hr
4
36 km/hr