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The two vehicles run from two places 90 kilometers apart at the same time. After 23 hours, the two vehicles meet on the way?
(90-60 × 23) △ 23 = (90-40) △ 23 = 50 △ 23 = 75 (km) a: car B travels 75 km per hour
The two trains run 83 km / h and 78 km / h from each other at the same time. When the two trains meet, a runs 249 km. The distance between the two places is 1000 km
249 △ 83 = 3 (hours)
3x78 = 234 (km)
234 + 249 = 483 (km)
A car and a bus run from a and B at the same time, facing each other. The car runs 100 kilometers per hour, and the bus 80 kilometers per hour. The two cars meet at 15 kilometers from the midpoint, and the two cars meet in a few hours. How many kilometers is the distance between a and B
If the distance between a and B is x km, the two vehicles will meet in X / (100 + 80) hours
(1/2x+15)/100= (1/2x-15)/80
0.5x=135
x=270
x/(100+80)=270/180=1.5
A: the distance between a and B is 270 km, so the two cars meet in 1.5 hours
A. The highway of city B is 400 kilometers long. A car drives from city a to city B. It takes 18 kilometers in the first hour and 310 kilometers in the second hour. How many kilometers are left?
400 × (1-18-310), = 400 × 2340, = 230 (km); a: there are 230 km left
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