On day 1, a car covers 300 km at 50 km/h. On day 2, same car travels at 60 km/h for 5 hours and on day 3, it covers 600 km in 9 hours at constant speed. What is the average speed of this car in these 3 days?

**(A)** 53 km/h

**(B)** 55 km/h

**(C)** 60 km/h

**(D)** 65 km/h

**(E)** None of the above

Distance covered on day 1 = 300 km

Distance covered on day 2 = speed time = 60 5 = 300 km

Distance covered on day 3 = 600 km

Total distance covered = 300+300+600 = 1200 km

Time taken on day 1 to cover 300 km hours

Time taken on day 2 to cover 300 km = 5 hours

Time taken on day 3 to cover 600 km = 9 hours

Total time taken = 6+5+9 =20 hours

Average speed =** (Total distance/total time) ** km/h

Hence, the answer is **(C)**.