anonymous
  • anonymous
Daria can wash and detail 3 cars in 2 hours. Larry can wash and detail the same 3 cars in 1.5 hours. About how long will it take to wash and detail the 3 cars Daria and Larry worked together?
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I was wondering what they mean by put differently? why is it 1/3.5 and not 3.5 over 1? Someone responded earlier: hickninja So Daria washes 1.5 cars per hour, and Larry washes 2 cars per hour. Assuming they work together perfectly, they can wash 3.5 cars per hour. Put differently, together they wash 1/3.5 = 2/7 cars per hour. So to wash 3 cars, it will take 3 * 2/7 = 6/7 of an hour. This works out to be about 51 minutes. 6/7 hr * 60 min/hr = 51 min.
richyw
  • richyw
\[\frac{3cars}{2hours}+\frac{3cars}{1.5hours}=\frac{9cars}{2hours}\] \[\frac{3 cars}{\frac{9cars}{2hours}}=6/9=2/3=40 mins\]
richyw
  • richyw
not sure if those fractions are correct at all. I'm tired

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anonymous
  • anonymous
It's multiple choice, and the correct answer is 51, so it must make some kind of sense
richyw
  • richyw
hmm give me a second i'll see what I did wrong
anonymous
  • anonymous
take your time!! :)
richyw
  • richyw
oops ok that first fraction should be \[\frac{7}{2}\] then \[\frac{3}{\frac{7}{2}}=\frac{6}{7}\] which is 51.4mins
richyw
  • richyw
so yeah, add the two rates and then divide the number of cars by the combined rate...
richyw
  • richyw
of course you can just take the shortcut since they are both the same number of cars in the initial problem and just do 3/3.5
richyw
  • richyw
but the way I showed will work even if the initial rate was like "2 cars in 4 hours" and "5 cars in 2" hours
anonymous
  • anonymous
hmm, this is calc free so it takes me a while
richyw
  • richyw
I know what you mean. It's always the the simple stuff like this that messes me up
anonymous
  • anonymous
add the two rates (cars per hour) which equal 3.5cars/1hr combined. And then divide the number of cars(3) by the combined rate (cars per hr). instead of multiplying the reversed fraction she had, divide the cars per hr. Your ending makes more sense to me. \[1.5car/hr + 2car/hr = 7cars/2 hr\] and 3cars made at that rate takes 6/7hr. all better! thanks man

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