I really need help, Physics isn't my strong subject at all! Question: Runner A starts at x = 0 and runs with a velocity of + 3.0 m/s toward runner B. Runner B starts at the same time at x = 20 m and runs with a velocity of -2.0 m/s toward runner A. Where do they meet, and how much time has elapsed since they started running?

where's the diagrams?

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.