Question

A car covers a total distance of 360 km. It covers the first 120 km at 40 km/h, the next 120 km at 60 km/h, and the remaining distance at a constant speed of x km/h. If the average speed for the entire journey is 48 km/h, then x is:

A 38 km/h
B 20 km/h
C 48 km/h
D 62 km/h
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