Party A and Party B travel from two opposite pairs at the same time. Party A travels 12 kilometers per hour and Party B travels 10 kilometers per hour. They meet 3 meters away from the midpoint to seek the distance between the two places

The distance between the two places is x km
(x/2+3):(x/2-3)=12:10
x=66
The distance between the two places is 66 km

Party A and Party B run from both places at the same time. In 3.5 hours, the two trains meet 12 kilometers away from the midpoint. The express train runs 36 kilometers per hour. How many kilometers are there between Party A and Party B?

12 km away from the midpoint, 12 * 2 = 24 km
The express is 36 * 3.5 = 126 km
Distance 126 * 2-24 = 252-24 = 228km

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