A passenger car and a freight car leave from a and B at the same time. After three hours of meeting, it takes eight hours for the freight car to complete the whole journey, and how long does it take for the passenger car to complete the whole journey

A passenger car and a freight car leave from a and B at the same time. After three hours of meeting, it takes eight hours for the freight car to complete the whole journey, and how long does it take for the passenger car to complete the whole journey

Hello
It takes 8 hours for trucks to complete the whole journey, 1 / 8 an hour
The two cars meet in three hours, one third of them every hour
Therefore, 1 / 3-1 / 8 of the whole journey per hour is 5 / 24
Therefore, it takes 1 ÷ (5 / 24) = 4.8 hours for the bus to complete the whole journey
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It takes 8 hours for the bus to complete the whole journey. The two trains leave for 3 hours and 20 minutes, and the distance between them is 120 km
It is known that the speed ratio of passenger cars to freight cars is 5:4, and how many kilometers can freight cars travel per hour

The distance between the two places is x km
The speed of passenger car is x / 8, and that of freight car is 0.1 X
After 3 hours and 20 minutes, the two vehicles drove 10 / 3 * (1 / 8 + 0.1) x = 0.75x km
So x-0.75x = 120
X = 480km
The speed of the truck is 48 km / h