Question 939695


to mow a lawn {{{10m}}} by {{{10m}}} takes {{{1h}}},=> a lawn {{{10m*10m=100m^2}}} takes {{{1h}}}

to mow a lawn {{{20m *12m=240m^2}}} takes {{{t*h}}} (t hours)

time will be proportional to area 

{{{100m^2:1h=240m^2:t*h}}}...solve for {{{t}}}

{{{100m^2*t*h=240m^2*h}}}

{{{100*t=240}}}

{{{t=240/100}}}

{{{t=2.4h}}} ....{{{0.4h=0.4*60min=24min}}}

{{{t=2h}}} and {{{24min}}} is an answer to the question how long will it take to mow a lawn {{{20m}}} by {{{12m}}}