A kilowatt hour is calculated by adding the watts together and deviding by 1000, this will give you kilowatts (kW). Then work out how many hours you are using this load for. multiply the kW by the...
Minutes per hour means, how many minutes are in a our so it would be 60 minutes per hour in math. But with cars... that's too complicated for you, wait for precalculus or learn about how graphs work...