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The slow and fast trains run from the two places at the same time. The slow train runs 48 kilometers per hour and the fast train 60 kilometers per hour. The two trains meet at the midpoint of 18 kilometers. What is the distance between the two places? It's better to use the linear equation of one yuan or the formula
The distance between the two places is x km
(x/2-18)/48 = (x/2+18)/60
x= 324
A and B buses leave from two places at the same time. After five hours, they meet at a distance of 40 kilometers from the midpoint. How many kilometers does the express train travel per hour and the local train travel per hour?
(85 × 5-40 × 2) △ 5, = (425-40 × 2) △ 5, = 345 △ 5, = 69 (km); a: the local train runs 69 km per hour
The two cars started from a and B at the same time and went opposite each other. The speed of the fast car was 88 kilometers per hour and the speed of the slow car was 72 kilometers per hour. After a few hours, they met at 20 kilometers from the midpoint
20 × 2 (88-72) = 2.5 hours
The two vehicles start from two places at the same time and want to go in the same direction. After three hours, they meet 15 kilometers away from the destination. It is known that the speed of the fast train is 88 km / h, and the speed of the slow train is calculated
Use the equation,
It should be the midpoint
Set the idle speed to x km / h,
3*（88-X)=15+15
88-X=10
X=78
The local speed is 78 km / h
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