I’m having a bit of trouble on this one, may I have some help please?

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

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

Percent increase and decrease. original number: 45 new number: 18