You should evaluate the mass of the system such that:

M = m_1 + m_2 = 2+4 = 6Kg

The problem provides the information that the force that acts on the system of masses is of 10 N.

You should remember the Newton's second law of motion such that:

`F = M*a`

Substituting 10 for F and 6 for M yields:

`10 = 6*a =gt a = 10/6 =gt a = 5/3`

`a ~~ 1.6`

You may evaluate the tension in the rope that connects the masses such that:

`F = 7*1.6 =gt F = 11.2N`

Hence, evaluating the tension in rope that connects the masses yields `F = 11.2N.`