Question

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
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