A car covers 15 km 20 km 30 km and 12...

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A car covers 15 km, 20 km, 30 km and 12 km at speeds of 20 km/h, 30 km/h, 40 km/h and 30 km/h, respectively. The average speed of the car for the total journey is:

A. 88 km/h

B. 60 km/h

C. 40 km/h

D. 30 km/h

Answer: Option D

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