in c please

Write a program that estimates the temperature in a freezer (in C) given the elapsed time (hours) since a power failure. Assume this temperature (T) is given by 20 t+2 where t is the time since the power failure. Your program should prompt the user to enter how long it has been since the start of the power failure in whole hours and minutes. Note that you will need to convert the elapsed time into hours. For example, if the user entered 2 30 (2 hours 30 minutes), you would need to convert this to 2.5 hours