A car from a to B, plan to travel 40 kilometers per hour, 6 hours to arrive. The actual 2 hours on the line 100 kilometers, according to this speed, from a to B Hurry, hurry

A car from a to B, plan to travel 40 kilometers per hour, 6 hours to arrive. The actual 2 hours on the line 100 kilometers, according to this speed, from a to B Hurry, hurry

40 × 6 = 240 km
100 △ 2 = 50 km / h
240 △ 50 = 4.8 hours. At this speed, the whole journey can be completed in 4.8 hours

The speed of car a is 40km / h. one hour after a starts from the east city, car B goes to the west city at the speed of 60km / h. If both cars return to the west city immediately after they arrive at the West City, Party A and Party B meet in one round trip. How about the distance and time interval between the two meeting places?
100-41*1=60km
60/40=3/2h
100/60=5/3h
100-1.5*60=10km
10/100=1/10h
1/10*40=4km
4*2/（60-40）*60-4=16h

The speed of car a is 40km / h. one hour after a starts from the east city, car B goes to the west city at the speed of 60km / h. If both cars return to the west city immediately after they arrive at the West City, Party A and Party B meet twice in a round trip. How about the distance and time interval between the two meeting places?
It takes 100 / 40 = 2.5 hours for car a to arrive at Xicheng from the east city. Because car B starts 1 hour late, car B only walks 1.5 × 60 = 90km when car a arrives at Xicheng, that is, car B is 10km away from Xicheng. At this time, car a returns from Xicheng, and it takes t hours for car a to leave from Xicheng
When meeting with car B, there is the equation: (40 + 60) t = 10, that is, t = 10 / 100 = (1 / 10) (hours), so the meeting place is 40 × (1 / 10) away from Xicheng
=If two cars meet for the second time after X hours from the first meeting, the equation is as follows: (60-40) x = 4 + 4 = 8, so x = (2 / 5) hours; the location of meeting is 20km away from Xicheng; the time interval between two meeting is (2 / 5) hours
[what you have done cannot be understood because there is no written explanation]