A and B start from ab at the same time and run in opposite directions. A runs 48 kilometers per hour, B 42 kilometers per hour. When B runs to all, B runs to At 7 / 20 o'clock in the whole journey, car a is still 24 kilometers away from the midpoint, so the distance between the two places should be calculated

A and B start from ab at the same time and run in opposite directions. A runs 48 kilometers per hour, B 42 kilometers per hour. When B runs to all, B runs to At 7 / 20 o'clock in the whole journey, car a is still 24 kilometers away from the midpoint, so the distance between the two places should be calculated

The speed of a is that of B: 48 △ 42 = 8 / 7
When B goes through 7 / 20 of the whole process, a can: 7 / 20 × 8 / 7 = 2 / 5
Distance between the two places: 24 (1 / 2-2 / 5) = 240 km

A and B vehicles start from AB and run in opposite directions at the same time. A vehicle runs 48 kilometers per hour, B vehicle runs 42 kilometers per hour, when B vehicle runs to 7 / 20 of the whole journey,
Car a is 24 kilometers away from the midpoint. How many kilometers are there between AB and car a?

The distance between the two places is x km
（x/2-24）/48=7/20x/42
The solution to this equation is
x=240
A: the distance between AB and ab is 240 km

A and B leave from ab at the same time. Car a travels 60 kilometers per hour, while car B takes 10 hours to complete the whole journey. When car B travels 13 / 24 of the whole journey, the distance between car a and a accounts for 5 / 8. How many kilometers is the distance between car a and ab?
Li Ming and Zhang Hong used to raise 250 chickens. After Li Ming sold 40 chickens and Zhang Hong sold one fifth of them, Li Ming had 30 more chickens than Zhang Hong. How many chickens did they raise

Speed ratio of two cars = 5 / 8:13 / 24 = 15:13
The whole process of a line = 10 △ 15 × 13 = 26 / 3 hours
Whole journey = 60 × 26 / 3 = 520km
Suppose Li Ming has x, then Zhang Hong has 250-x
X-40=(250-X)*(1-1/5)+30
X-40=170-4X/5
9X/5=270
X=150
There are 150 for Li Ming and 100 for Zhang Hong

Car a and car B leave from a and B at the same time. They go opposite each other and meet 10 hours later. When they meet, car a drives 60% of the whole journey, just 300 kilometers more than car B. how many kilometers does car a drive per hour?

B: 1-60% = 40% a: 300 ÷ (60% - 40%) × 60% = 300 ／ 0.2 × 0.6 = 900 (km) 900 ／ 10 = 90 (km) a: A: 90 km per hour