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)
Hence, the answer is (B).