A mechanic can install carburetors in 3 cars every 4 hours. At that rate, how long will it take the mechanic to install carburetors in 5 cars? A.) 6 hours 20 minutes B.) 6 hours 40 minutes C.) 7 hours 15 minutes D.) 7 hours 40 minutes E.) 7 hours 45 minutes 3 cars 5 cars  =  {set up a proportion} 4 hours x hours 3x = 20 {crossmultiplied} x = 20/3 {divided both sides by 3} x = 6 2/3 {changed to mixed number} x = 6 hours 40 minutes {2/3 of an hour is 40 minutes} B.) 6 hours 40 minutes  Algebra House
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