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So in effect the person loses 15 minutes for each cigarette smoked.
so in one year he/she would lose 365(15)c minutes
so in y years, he/she would lose 365(15)cy minutes
T = 5475cy minutes
for c=20, y=10
T = 5475(20)(10) minutes = 1095000minutes.
divide by 60 to get hours
divide by 24 to get days, etc.