Halfway through a 240 km run a train is held up for 1 hour. To arrive on time it covers the remaining 120 km at 20 km/h above its usual speed. What is its usual speed?

Question

Accepted Answer

40 km/h. 120/v-120/v+20=1 → v(v+20)=2400 → v=40 km/h. Check: 3 h vs 2 h. (60 km/h is the raised speed.)

Halfway through a 240 km run a train is held up for 1 hour. To arrive on time it covers the remaining 120 km at 20 km/h above its usual speed. What is its usual speed?

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