If I understand the problem correctly then you should use the concept of net force. Jane's net force is (.92 m/s^2) * 60kg. Now use the formula F_net=ma, and solve for John's acceleration.
Jane and John, with masses if 50 kg and 60 kg, respectively, stand on a frictionless surface 10 m apart. John pulls on a rope that connects him to Jane, giving Jane an acceleration of 0.92 m/s2. At what rate will John accelerate? What is the direction of his acceleration?