A hill train climbs 90 km at 18 km/h, halts 1 hour at the top, and comes down at 30 km/h. What is its average speed for the round trip, halt included?

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Accepted Answer

20 km/h. Up 5 h, halt 1 h, down 3 h: 9 h for 180 km → 20 km/h. (22.5 leaves out the halt; 24 is the plain mean of 18 and 30.)

A hill train climbs 90 km at 18 km/h, halts 1 hour at the top, and comes down at 30 km/h. What is its average speed for the round trip, halt included?

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