A and B start from ab at the same time, and run in opposite directions. After driving for 1.5 hours, the two vehicles are 87 kilometers apart. After driving for another 0.5 hours, the two vehicles collide The distance is 38 kilometers. If car a travels 42 kilometers per hour, how many kilometers per hour does car B travel

A and B start from ab at the same time, and run in opposite directions. After driving for 1.5 hours, the two vehicles are 87 kilometers apart. After driving for another 0.5 hours, the two vehicles collide The distance is 38 kilometers. If car a travels 42 kilometers per hour, how many kilometers per hour does car B travel

Set car B to travel x kilometers per hour
（87-38）/(42+x)=0.5
49=21+0.5x
X = 56 km / h

A and B start from ab at the same time and travel in opposite directions for 1.5 hours. The distance between the two vehicles is 87 kilometers, and the distance between the two vehicles is 38 kilometers. If a vehicle travels 42 kilometers per hour, how many kilometers per hour does B vehicle travel?

A 2.5 hour driving distance:
42 * 2.5 = 105 km
Distance between a and B for the first 1.5-hour journey:
105-87 = 18 km
B 2.5 hours driving distance:
38-18 = 20 km
B's speed:
20÷2.5=8km/h

Party A and Party B walk from a and B at the same time. Party A travels 100 meters per minute and Party B 120 meters per minute. After 12.5 minutes, they are 150 meters apart. How many meters are there between a and B? (analysis of various situations)

① There are 150 meters between them to meet (100 + 120) × 12.5 + 150 = 220 × 12.5 + 150 = 2750 + 150 = 2900 (meters); ② there are 150 meters between them after meeting, (100 + 120) × 12.5-150 = 220 × 12.5-150 = 2750-150 = 2600 (meters) a: the distance between a and B is 2900 meters or 2600 meters