Question

A car travels from A to B, a distance of 180 km. It covers the first 60 km at 40 km/h, the next 60 km at 60 km/h and the last 60 km at 90 km/h. Find the approximate average speed for the whole journey.

A 56 km/h
B 77 km/h
C 20 km/h
D 33 km/h
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