A. B two cars from the East and west at the same time, a car 50 kilometers per hour, B car 42 kilometers per hour, two cars from the terminal 16 kilometers meet How many kilometers is the distance between the East and the west

16 kilometers from the midpoint, right?
When they meet, a travels 16 × 2 = 32 kilometers more than B
Every hour, a travels 50-42 kilometers more than B = 8 kilometers
Encounter time: 32 △ 8 = 4 hours
The distance between the two places is (50 + 42) × 4 = 368km
Comprehensive formula: 16 × 2 △ 50-42 × (50 + 42) = 368km

After driving for a period of time, the two cars meet at a distance of 24km from the midpoint. The distance between car a and car B is 48km / h and 42km / h

Set driving time for X hours:
（48-42）x=24*2
x=8
Then the distance between the two cities is (42 + 48) * 8 = 720 (km)

A and B are 42 kilometers apart. If they walk in opposite directions, they will meet in 2 hours. If they walk in the same direction, it will take 14 hours for B to catch up with A. then a and B walk () kilometers each hour
A. 12，9B. 11，10C. 10，11D. 9，12

Let a walk x kilometers per hour and B walk y kilometers per hour. Then 2x + 2Y = 4214y = 14x + 42, the solution is x = 9y = 12, so D

A. B is 400 km away from the two places, and a and B vehicles leave each other at the same time. A vehicle travels 38 km per hour, B vehicle 42 km per hour, how many hours are the two vehicles 40 km apart?

(1) (400-40) / (38 + 42) = 360 / 80 = 4.5 (hours) (2) (400 + 40) / (38 + 42) = 440 / 80 = 5.5 (hours) answer: 4.5 hours or 5.5 hours, the distance between the two cars is 40 km

A. B two cars from the East and west at the same time, a car 50 kilometers per hour, B car 42 kilometers per hour, two cars from the terminal 16 kilometers meet How many kilometers is the distance between the East and the west