A car needs to cover 800 km of distance. It covers first 500 km in 4 hours at constant speed. What should be the speed of this car to cover next 300 km so that the average speed of this car is 80 km/h.

**(A)** 45 km/h

**(B)** 50 km/h

**(C)** 55 km/h

**(D)** 60 km/h

**(E)** None of the above

Time taken to cover first 500 km = 4 hours

Let speed of the car to cover next 300 km km/h

Time taken to cover next 300 km hours

Total time for the entire journey hours

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

**Total time = (Total distance/Average Speed)**

km/h

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