Question 1128731
Let {{{ t }}} = time in hrs using the push mower
{{{ t - 3.5 }}} = time in hrs using riding mower
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{{{ 1/t + 1/( t - 3.5 ) = 1 / 2.75 }}}
Multiply by {{{ t*( t - 3.5 )*2.75 }}}
{{{ 2.75*( t - 3.5 ) + 2.75t = t*( t - 3.5 ) }}}
{{{ 2.75t - 9.625 + 2.75t = t^2 - 3.5t }}}
{{{ t^2 - 9t + 9.625 = 0 }}}
{{{ 1000t^2 - 9000t + 9625 = 0 }}}
{{{ 8t^2 - 72t + 77 = 0 }}}
Use quadratic formula, find {{{ t }}} and {{{ t - 3.5 }}}Get a 2nd
opinion if needed