It takes six hours for a bus to go from place a to place B, and eight hours for a freight car to go from place a to place B. the two cars leave each other at the same time. When they meet, the freight car runs 240km. How many km is the distance between a and B

Encounter time = 1 ÷ (1 / 6 + 1 / 8) = 4.8 hours
Truck speed = 240 △ 4.8 = 50 km / h
The distance between the two places is 50 × 8 = 400 km

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