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**Please help with physics question!!**

I have been set a question to answer, although i do not know where to start, could anyone help or give me a starting poing please?

A swing bridge of mass 6500 kg has to be turned through an angle of 92 degrees in 148 seconds. The first 52 seconds is a period of uniform angular acceleration, the subsequent 30 seconds is a period of uniform velocity and the third period of uniform angular retardation. Find the maximum angular velocity, the acceleration and retardation. If the radius of gyration of the bridge is 7.794 kgm², determine the torques required to start and stop the bridge moving.