Question 498851
Er...not quite!
Try:
{{{(1/45)x+(1/30)x = 1}}} Simplify and solve for x.
{{{(2/90)x+(3/90)x = 1}}}
{{{(5/90)x = 1}}} Multiply both sides by 90.
{{{5x = 90}}} Divide both sides by 5.
{{{x = 18}}}minutes.