NEED PHYSICS HELP ASAP!!! I don't know what I'm supposed to do and my assignment is due in a few hours! HELP?

here is the question:

In a cycling road race consisting of a flat section and an uphill section, a particular cyclist pedals with an average power of 324 Watts for 5.50 hours on the flat section of the course, and an average power of 418 Watts for 30.0 minutes while climbing the uphill section, which has an average grade of 6%. Potentially useful information: Power = Energy/time; 1 Watt = 1 Joule/sec; 1 kcal = 4186 J

(Note, 1 kcal = 1 food Calorie)

(a) Calculate the average mechanical power output of the cyclist over the whole race.
(b) Given that the human body has an efficiency of 25.0% at converting food energy into mechanical

output, how many kcal of food energy must the cyclist consume to replace the mechanical energy expended during the race?

im new to physics and have absolutely no clue what im supposed to do. I've tried asking other classmates, other teachers, etc and nothing is helping. all i hear is rambling words that have no meaning. please someone help!!
NEED PHYSICS HELP ASAP!!! I don't know what I'm supposed to do and my assignment is due in a few hours! HELP?
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