SOLUTION: Only one question per post please: A machine makes tin boxes at the rate of 78 in 5 minutes. How long will it take to make 3,900 of them? (Answer in hours and minutes)

Question 935020: Only one question per post please:
A machine makes tin boxes at the rate of 78 in 5 minutes. How long will it take to make 3,900 of them? (Answer in hours and minutes)

Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
r = w/t
t = w/r
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r = 78/5 boxes/minute
t = 3900/(78/5)
t = 250 minutes
t = 250 minutes * (1/60 hour/minute) = 4.17 hours
t = 4 hours and (0.17 hour * 60 minutes/hour) minutes
t = 4 hours and 10.2 minutes
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