Question 248633
Trent's rate of delivering papers plus
Lois's rate of delivering papers equals
their rate working together.
In words:
(1 route)/(Trent's time) + (1 route)/(Lois's time) = (1 route)/(time working together)
{{{1/30 + 1/20 = 1/x}}}
Multiply both sides by {{{60x}}}
{{{2x + 3x = 60}}}
{{{5x = 60}}}
{{{x = 12}}} minutes