The two vehicles of Party A and Party B set out at the same time at a distance of 530km from each other. The speed of car a is 30km / h less than that of car B, and the distance between the two vehicles is 2H later 50km, find the speed of two cars

The two vehicles of Party A and Party B set out at the same time at a distance of 530km from each other. The speed of car a is 30km / h less than that of car B, and the distance between the two vehicles is 2H later 50km, find the speed of two cars

Set the speed of vehicle B as X km / h
2*(2X-30+X)+50=530
2*(3X-30)=480
3X-30=240
3X=270
X=90
Speed of car a = 90 * 2-30 = 150 km / h

A. B is 30km apart. A's speed is 6km. B's speed is 4km. After a few hours, they are 40km apart

After X hours, the distance between them is 40km
(4+6)x=40-30
10x=10
x=1
One hour later, they were 40 km apart

When a arrives at B, B is 30km away from A. when B arrives at a, a is 40km away from B
When a arrives at B, B is 30km away from A. when B arrives at a, a is 40km away from B. the distance between a and B is calculated. Using proportional solution, there is a process in the process of solution

Let the distance between AB and ab be s km
s / (s - 30) = 40 / 30
3s = 4s - 120
S = 120 km