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?

A 20 km/h
B 67 km/h
C 40 km/h
D 56 km/h
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