Known a, B two cities, a, B two people walk opposite, four hours meet. B another hour just to the midpoint

Known a, B two cities, a, B two people walk opposite, four hours meet. B another hour just to the midpoint

It will take another hour for Party B to travel the distance of party a when they meet, so the speed ratio of Party A and Party B is 6:4
6/（6+4）=3/5
Nail speed: 1 / 4 * (3 / 5) = 3 / 20
1 / (3 / 20) = 6 (2 / 3) (hours)
Speed B: 3 / 20 * (2 / 5) = 1 / 10
1 / (1 / 10) = 10 (hours)

3. At 8 o'clock in the morning, car a and car B go from city a and city B to each other at the same time. At 10 o'clock, the two cars are 112.5 kilometers apart. They continue to March until 1 p.m
3. Speed sum of vehicle a and B: 112.5 × 2 △ 13-10 = 75 km
A. B distance between the two places: 75 × (10-8) + 112.5 = 262.5km
Why is this the answer

The question of the landlord is how many kilometers are there between a and B?
Your title is not complete. According to my guess, you want to say that the distance between the two cars is 112.5km after they meet at 1pm!
Let the speed of car a be x, the speed of car B be y, and the distance of 112.5km is 13-10 = 3 hours
That is, (x + y) × 3 = 112.5 × 2, then (x + y) = 75
At 10 o'clock, the distance between Party A and Party B is divided into three sections, that is, the distance of car a + 112.5km + the distance of car B
Distance driven by vehicle a + distance driven by vehicle B, namely: (x + y) × (10-8)
The distance between a and B, that is: (x + y) × (10-8) + 112.5 =
I don't need to explain the rest, do I?!

The distance between a and B is 520 km. AB two cars start from two places at the same time at 11:00 a.m. and run opposite to each other. At 3:00 p.m., the two cars meet,
How many kilometers per hour does bus B travel?

It took four hours from 11 a.m. to 3 p.m
520÷4-60
=130-60
=70 km / h
A: car B travels 70 kilometers per hour

At 8:00 a.m., a and B start from each other at the same time. At 10:00 a.m., the distance between the two vehicles is 90km. Continue to drive until 2:00 p.m., the distance between the two vehicles is 90km after they meet
A. B what's the distance between the two places?

Speed and speed of two vehicles:
90*2/(14:00-10:00)
=180/4
=45km/h
A. B the distance between the two places is:
45*（10：00-8:00）+90
=90+90
=180 km .