Aman goes to his office by car at the speed of 80 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 car to reach on time?

A

480/11 km/hr

B

240/6 km /hr

C

450/7 km/hr

D

480/13 km/hr