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A train covers two-thirds of its route at 60 km/h and the rest at 30 km/h. What is its average speed over the whole route?

Competition practiceProblems on Trains

A45 km/h
B50 km/h
C40 km/h
D48 km/h

Step-by-Step Solution

Take the route as 3 km: time

= \frac{2}{60} + \frac{1}{30} = \frac{4}{60}

h. Average

= 3 \div \frac{4}{60} = 45

km/h. (50 km/h weights the speeds by distance, which is wrong.)

Answer: A) 45 km/h

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