Answer: THE TOTAL AMOUNT TAKEN BY KEVIN IN MIXING, BAKING, AND COOLING THE MUFFINS IS 30 MINUTES.
Explanation:
1. AMOUNT TAKEN BY KEVIN FOR MIXING=8MIN.
2. AMOUNT TAKEN BY KEVIN FOR BAKING=17 MIN.
3. AMOUNT TAKEN BY KEVIN FOR COOLING=5MIN.
IN TOTAL, (8+17+5)MIN. = 30 MIN.