Which of the following expressions represents the distance between 1 3
and - ?
4 4
3
4
2
4
1
4
0
4
1
4
2
4
3
4
4
4
5
4
6
4
Choose 1
A
1 3
+
4
4
1
3.
B
4 4
С
None of the above

How to do this , and can some one explain

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

What is the result of the following division?