Question 955126
The areas of the 2 walls are in the
same ratio as the times required to paint them:
( area 1 ) / ( area 2 ) = ( time 1 ) / ( time 2 )
{{{ ( 12*12 ) / ( 15*16 ) = (( 3/4 )) / t }}}
where {{{ t }}} is in hrs
{{{ 144 / 240 = (( 3/4 )) / t }}}
Multiply both sides by {{{ 240t }}}
{{{ 144t = 180 }}}
{{{ t = 180/144 }}}
{{{ t = 1.25 }}}
The larger wall will take 1 hr 15 min to paint