Question

A car travels 60 km at a speed of 30 km/hr, then 90 km at a speed of 45 km/hr, and finally 80 km at a speed of 40 km/hr. Find the average speed of the car for the entire journey.

A 36 km/hr
B 38.33 km/hr
C 40 km/hr
D 42.25 km/hr
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