For a 25-kW, 230-V, three-phase, 60-Hz squirrel-cage motor opera

For a 25-kW, 230-V, three-phase, 60-Hz squirrel-cage motor operating at rated voltage and frequency, the rotor I2R loss at maximum torque is 9.0 times that at full-load torque, and the slip at full-load torque is 0.023. Stator resistance and rotational losses may be neglected and the rotor resistance and inductance assumed to be constant. Expressing torque in per unit of the full-load torque, find
a. The slip at maximum torque.
b. The maximum torque.
c. The starting torque.