The fast train and the slow train leave each other from a and B. one fifth of the current whole journey of the fast train goes 11 kilometers later, and the slow train leaves. When they meet, the slow train runs the whole journey Two out of seven. The speed ratio of the two cars is 5:4. How many meters is the distance between a and B

The fast train and the slow train leave each other from a and B. one fifth of the current whole journey of the fast train goes 11 kilometers later, and the slow train leaves. When they meet, the slow train runs the whole journey Two out of seven. The speed ratio of the two cars is 5:4. How many meters is the distance between a and B

11÷(2/7×5/4-1/5)
=11÷(5/14-1/5)
=11÷11/70
=70km