A train must cover 400 km in 6 hours. After 3 hours at 60 km/h it is held at a signal for 20 minutes. At what speed must it run the rest of the way to arrive on time?

Question

Accepted Answer

82.5 km/h. Left: 400-180=220 km in 6-3-1/3=8/3 h → 220×3/8=82.5 km/h. (73.3 forgets the 20-minute hold.)

A train must cover 400 km in 6 hours. After 3 hours at 60 km/h it is held at a signal for 20 minutes. At what speed must it run the rest of the way to arrive on time?

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