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It takes 5 hours for an express train to go from station a to station B, and 8 hours for a local train to go from station B to station a. the express train starts 2 hours before the local train starts. The two trains meet How many hours did the express run? A project is completed in 30 days by Party A alone and 20 days by Party B alone. Now it is completed in 18 days by Party A and Party B. after a four-day break, how many days does Party A have?
(1-1/5×2)÷(1/5+1/8)+2
=3/5÷13/40+2
=24/13+2
=3 and 11 / 13 hours
An express train and a local train start from city a and city B at the same time and run in opposite directions. After 7 hours, the two trains meet. This is the ratio of the express train to the local train. It is known that the ratio of the express train to the local train is 5:4
The local train runs 60km per hour, seeking the whole journey
An express train and a local train start from city a and city B at the same time and run in opposite directions. After 7 hours, the two trains meet. This is the ratio of the express train and the local train, which is 5:4. It is known that the local train runs 60km per hour, and the whole journey is calculated
Distance ratio = 5:4, local distance = 60 x 7 = 420
Total distance = 420 x (5 + 4) / 4 = 945 km
An express train and a local train run from A. B. they meet after 6 hours. After meeting, they run for another 2 hours. At this time, they are fast
The distance between a and B is 20% of the whole journey, and the local train has traveled a total of 400 kilometers. How many kilometers are there in a and B?
It's better to use the binary equation
Six hours, two cars travel the whole journey
So in 8 hours, the two cars travel 8 / 6, that is, 4 / 3 of the whole journey
Among them, the express train has gone: 1-20% = 80% of the whole journey
Slow train: 400 km
Therefore, the whole journey is: 400 ÷ (4 / 3-80%) = 750 km
A: the distance between AB and ab is 750 km
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