Mathematics: Loc can mow his entire lawn in 20 minutes; loc s roommate reza needs 30 minutes to mow the entire lawn. if loc starts mowing at 1: 00, mows for five minutes and then reza starts to with his own mower, at what time will they finish mowing the lawn? express your answer in the form h: mm.

Loc can mow his entire lawn in 20 minutes; loc s

Ответ:

kiki4832

31.12.2021

$Loc:\\entire\ lawn\ in\ 20min\\\frac{1}{20}\ lawn\ in\ 1min\\\\Reza:\\entire\ lawn\ in\ 30min\\\frac{1}{30}\ lawn\ in\ 1min\\\\Loc\ and\ Reza\ together:\\\frac{1}{20}+\frac{1}{30}=\frac{3}{60}+\frac{2}{60}=\frac{5}{60}=\frac{1}{12}\ lawn\ in\ 1min\\-----------------------\\Loc\ mows\ for\ 5\ min,\ 5\times\frac{1}{20}=\frac{1}{4}\ lawn\\------------------------$

$Loc\ and\ Reza\ together\ the\ rest\ of\ the\ lawn\ (\frac{3}{4})\ in\ "t"\ time:\\\frac{1}{12}t=\frac{3}{4}\ \ \ \ \ |multiply\ both\ sides\ by\ 12\\\\t=3\times3\\\\t=9\ (min)\\------------------\\5min+9min=14min\\\\\boxed{At\ 1:14.}$

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Ответ:

wendy1538

31.12.2021

Mathematics

$x\ \rightarrow\ \ \ time\ of\ mowing\ of\ lawn \\\\ \frac{20-5}{20} =( \frac{1}{20} + \frac{1}{30} )\cdot (x-5)\\\\ \frac{15}{20} = \frac{3+2}{60}\cdot (x-5)\\\\ \frac{3}{4} = \frac{5}{60} \cdot (x-5)\\\\ \frac{3}{4} = \frac{1}{12} (x-5)\ /\cdot12\\\\ \frac{3}{4} \cdot12=x-5\\\\9=x-5\ \ \ \Rightarrow\ \ \ x=14\ (minutes)\\\\Ans.\ Lok\ and\ Reza\ finish\ mowing\ the\ lawn\ at\ 1:14$

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Ответ:

erinmcdonald6673

31.03.2022

Mathematics

2 7/8= 2/3L
Divide both sides by 2/3 and get 4.31 or 4 5/16
Hope this helps!!

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Loc can mow his entire lawn in 20 minutes; loc's roommate reza needs 30 minutes to mow the entire lawn. if loc starts mowing at 1: 00, mows for five minutes and then reza starts to with his own mower, at what time will they finish mowing the lawn? express your answer in the form h: mm.

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