Question
A traveller needs to go 420 kilometres, partly using a bike
and partly by car. If the speed of bike and car is 50 km/h and 100 km/h respectively, and 50% of the journey is completed by bike, what is the approximate average speed for the whole trip?Solution
ATQ,
Time taken by bike = (0.50 × 420) / 50 = 210 / 50 = 4.2 hours
Time taken by car = (0.50 × 420) / 100 = 210 / 100 = 2.1 hours
Average speed = 420 / (4.2 + 2.1) = 420 / 6.3 ≈ 67 km/h
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