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From place a to place B, it takes 8 hours for passenger cars and 6 hours for freight cars to complete the whole journey How many parts of the whole journey
When meeting, the distance ratio of bus and truck is: 1 / 8:1 / 6 = 3:4
When meeting, the number of passenger cars is less than that of freight cars: (4-3) / (4 + 3) = 1 / 7
The bus and the truck start from a and B at the same time and run in opposite directions. They meet in six hours. After meeting, the bus goes to B in four hours. It takes several hours for the truck to complete the whole journey
It's better to explain the reason and be clear
The time for the bus to complete the whole journey is 6 + 4 = 10 hours
Take the distance between two places as unit 1
Then the speed of the bus is 1 / 10, and the sum of the two speeds is 1 / 6
Truck speed = 1 / 6-1 / 10 = 1 / 15
It takes 1 / (1 / 15) = 15 hours for a truck to complete the whole journey
The passenger cars and freight cars leave from ab at the same time. The passenger cars travel 60 kilometers per hour, and the freight cars travel one tenth of the whole journey per hour. When the freight cars travel to 13 / 24 of the whole journey, the passenger cars already travel 5 / 8 of the whole journey
13 / 24 / 1 / 10 × 60 / 5 / 8 = 520km
AB is relatively open, the passenger car runs 60 kilometers per hour, the freight car runs 1 / 10 of the whole journey per hour, the freight car runs to 13 / 24, the passenger car runs 5 / 8 of the whole journey, what are the two places
The truck runs 1 / 10 of the whole journey every hour, and the truck runs 13 / 24 △ 1 / 10 = 65 / 12 hours when it reaches 13 / 24 of the whole journey
60 × 65 / 12 = 325km
The distance between the two places is 325 △ 5 / 8 = 510km
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