Question
A person goes on a 500 km trip using car and plane. The
speed of the car is 80 km/h while the plane travels at 200 km/h. If 30% of the trip is by car, find the approximate average speed for the entire trip.Solution
ATQ,
Time taken by car = [(0.30 × 500)/80] = (150/80) = 1.875 hours
Time taken by plane = [(0.70 × 500)/200] = (350/200) = 1.75 hours
Average speed = [(Total distance)/(Total time)] = [500/(1.875 + 1.75)] = (500/3.625) ~ 138 km/h
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