I need a answer plss its urgent

If 20% of a number is 35, what is 50% of that number?

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

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?