Question

Points R, S and T lie on a number line, where S is between R and T. The distance between R and S is 6, and the distance between R and T is 15.

Quantity A:
The distance between the midpoints of line segments RS and ST


Quantity B:
The distance between S and T

Answer 1

Which is greater or are they equal

Answer 2

Let's just draw number line:

Since they didn't say about about the value of R, S, and T, we can just assume that R = 0.

So S would be 6, and T would be 15.