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: Timeā = 60 Ć· 40 = 1.5 h Timeā = 90 Ć· 45 = 2 h Total distance = 60 + 90 = 150 km Total time = 1.5 + 2 = 3.5 h Average speed = 150 Ć· 3.5 = 42(6/7) km/h
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