Forces Rope Problem!

1. The problem statement, all variables and given/known data
Suppose a 69-kg boy and a 48-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.

2. Relevant equations

3. The attempt at a solution
I don't understand how to solve it. Or draw a free-body diagram...and go from there.


Homework Helper
Apply Newton's third law.
I don't understand how that would help me to solve the problem. Can you help me get started please?
Nevermind, I was asking too much for a simple problem. I understand it now and I solved it. Thank you for your help!

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