Question
A motorcycle covered the first 60 km of its journey at
an average speed of 40 km/h. The speed of the motorcycle for covering the rest of the journey, i.e. 90 km, was 45 km/h. During the whole journey, the overall average speed of the motorcycle was:Solution
ATQ,
First, find the time for each part of the journey: Time₁ = 60 ÷ 40 = 1.5 h Time₂ = 90 ÷ 45 = 2 h Total distance = 60 + 90 = 150 km Total time = 1.5 + 2 = 3.5 h Average speed = 150 ÷ 3.5 = 42(6/7) km/h
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