Question
A journey of 600 km is undertaken by a person who travels
part of it by jeep and the remaining by flight. The speed of the jeep is 80 km/h, and that of the flight is 240 km/h. If 30% of the journey is by jeep, find the average speed of the full journey.Solution
ATQ,
Time taken by jeep = (0.30 × 600) / 80 = 180 / 80 = 2.25 hours
Time taken by flight = (0.70 × 600) / 240 = 420 / 240 = 1.75 hours
Average speed = 600 / (2.25 + 1.75) = 600 / 4 = 150 km/h
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