Initial angular speed of a fan decelerating from high to low

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choole
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An electric fan is running on HIGH. After fan has been running of 13.2 minutes, the LOW button is pushed. The fan slows down to 98 rad/sec in 1.83 seconds. The blades of the fan have a radius of 0.62 meters and their deceleration rate is 42.3 rad/sec2.

What was the initial angular speed of the fan in rev/sec?
 

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look at the second omega and alpha... its only one step to the solution...

edit: does seem to belong there eh pete?