The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from place a to place B Never: two trains leave from a and B at the same time. They run in opposite directions. The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from a to B. how many hours do they meet after they leave? I'm in a hurry. There must be a result in 2 hours

The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from place a to place B Never: two trains leave from a and B at the same time. They run in opposite directions. The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from a to B. how many hours do they meet after they leave? I'm in a hurry. There must be a result in 2 hours

12 * 5 / (5 + 3) = 7.5 hours

One train goes from place a to place B at a speed of 60 kilometers per hour, and the other from place a at a speed of 40 kilometers per hour
How many kilometers are there between the two trains an hour before they meet?

Answer: 60 + 40 = 100

At 9:05 a.m., the train leaves from place a at a speed of 120 kilometers per hour and travels 90 kilometers to place B. when does the train arrive at place B

90 / 120 = 0.75 hours = 45 minutes
So the train arrives at 9:50

At 9:05 a.m., a train leaves from place a at the speed of 120 kilometers per hour, and runs for 9 kilometers to place B. the time to get to place B is () minutes

Passing time = 9 △ 120 = 0.075 hours = 4.5 minutes
At 9:05 a.m., a train leaves from place a at the speed of 120 kilometers per hour, and runs for 9 kilometers to place B. the time to get to place B is (9) hours (9.5 minutes)