Hola, ! . necesito 6 ejemplos y ejercicios de la función racional aplicada en la vida cotidiana y aplicada en el universo de marvel.

¡¡¡gracias por su atenció!

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Can someone explain to me how to do

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.