A car travels 180 km at 90 km/h and then travels another 120 km at 40 km/h. What is the average speed of this car?
(A) 75 km/h
(B) 65 km/h
(C) 60 km/h
(D) 50 km/h
(E) None of the above
Time
Total travelling time
hours
Total distance = 180 km + 120 km = 300 km
Average speed = (Total distance/Total time)
km/h
Hence, the answer is (C).
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