In put Power to the motor can be determined from the given voltage, current & pf values.
Assuming no loss in the air gap, the above calculated power can be considered as power input to the rotor
In put Power = 2 x pi x Torque X Synch. speed/60
Synch. speed = 3000 rpm
so Torque can be determined.
Out put power = 2 x pi x Torque X actual speed (2900 rpm)/60
knowing output power & input power, efficiency can be calculated.