A car travels 30 km at a uniform speed of 40 km/h and next 30 km at a uniform speed of 20 km/h.
Its average speed is
A) 30 km/h
(B) 32 km/h
(C) 26 2/3 km/h
(D) 28 3/4 km/h
Answers
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Answer:
(C)
Explanation:
Average Speed = Total Distance ÷ Total Time
Total Distance = 30 + 30 km = 60 km
Time for first half = 30/40 h = 3/4 h = 0.75 h
Time for second half = 30/20 h = 1.5 h
Total Time = 1.5 + 0.75 h = 2.25 h
Average Speed = 60/2.25 km/h = 26 2/3 km/h
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