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 Homework Statement:

Two ocean liners, each with a mass of 42,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Treat the ships as particles.
I've calculated the Force but I'm struggling to calculate acceleration.
 Relevant Equations:

F=GMm/r^2
F=ma
This is what I've done so far: