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I need help with a physics question...

A car with mass of 1500 kg is travelling at 80 km/hr. The driver is in a situation where he needs to stop the car in 20s. The car has been fitted with disc brakes in all four wheels and the effective surface area of the disc is 0.3 m2. It is estimated that 80% of the heat transfer from the disc occurs by a combination of convection and radiation. The combined convection and radiation heat transfer co-efficient is 100Wm-2K-1 and the surrounding temperature is 25°C. Calculate the disc temperature.