Question
Traveling 500 km, a driver covers the first 40% at 70
kmph, the next quarter at 60 kmph, and the remaining distance at 50 kmph. What is the average speed?Solution
ATQ, Time for the first segment at 70 kmph = (500 × 0.40) / 70 = 2.86 hours Time for the second segment at 60 kmph = (500 × 0.25) / 60 = 2.08 hours Distance for the third segment = 500 - (500 × 0.40) - (500 × 0.25) = 500 - 200 - 125 = 175 km Time for the third segment at 50 kmph = 175 / 50 = 3.5 hours Average speed = 500 / (2.86 + 2.08 + 3.5) ≈ 58.14 kmph
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