The fast train and the slow train leave each other from a and B. the fast train starts the whole journey 15 km and 11 km before the slow train starts. When they meet, the slow train runs 27% of the whole journey. It is known that the speed ratio of the fast train and the slow train is 5:4. How many kilometers are there between a and B?

The fast train and the slow train leave each other from a and B. the fast train starts the whole journey 15 km and 11 km before the slow train starts. When they meet, the slow train runs 27% of the whole journey. It is known that the speed ratio of the fast train and the slow train is 5:4. How many kilometers are there between a and B?

11 ^ [(1-27) - (27 ^ 4 × 5 + 15)], = 11 ^ [57 - (514 + 15)], = 11 ^ [5070 − 3970], = 11 ^ 1170, = 11 × 7011, = 70 (km); answer: the distance between a and B is 70 km