A and B start from Guoshi of a and B respectively, and travel in opposite directions. A car travels 80 kilometers per hour, B car travels one tenth of the whole journey per hour. When B car arrives at 5 / 8 of the whole journey, a car can reach a of B by another one sixth of the whole journey. How many kilometers is the distance between B and a

A and B start from Guoshi of a and B respectively, and travel in opposite directions. A car travels 80 kilometers per hour, B car travels one tenth of the whole journey per hour. When B car arrives at 5 / 8 of the whole journey, a car can reach a of B by another one sixth of the whole journey. How many kilometers is the distance between B and a

5 / 8 △ 1 / 10 = 25 / 4 hours
80x25 / 4 = 500km
1-1/5=5/6
500 △ 5 / 6 = 600 km
So it's 600 kilometers away

Party A and Party B leave from ab. they meet at 2 o'clock. After meeting, they continue to move forward. When Party A and Party B leave a, they are 60 kilometers away. The speed ratio of the two cars is 3:2

If the speed ratio of a and B is 3:2, a will travel 3 / 5 of the whole journey, B will travel 2 / 5 of the whole journey, then a will travel (3 / 5) / 2 = 3 / 10 of the whole journey per hour, B will travel (2 / 5) / 2 = 1 / 5 of the whole journey per hour, a will arrive at B, then it will take (2 / 5) / (3 / 10) = 4 / 3 hours, because a and B will meet in 2 hours