DC motor question

1. The problem statement, all variables and given/known data
A machine, with an armature resistance of 0.16 ohms and K##\phi## is to drive a load that requires a torque that is proportional to its speed. One point on the mechanical torque-speed relation is 16 Nm at 400 r/min. If the armature terminal voltage is 50 V, at what steady-state speed will the load be driven?

2. Relevant equations

##T=K\phi i_a##, for a constant machine speed

The torque speed relation is
##w = \frac{V_t}{K\phi} - \frac{R_a}{(K\phi)^2}T##

3. The attempt at a solution
the only thing missing for me to use the torque speed relation is the load torque, but I don't understand what they did here to get it. I don't know what A is.