Question 586412
Not quite!
{{{x/7 + x/3 = 1}}} Simplify.
{{{10x/21 = 1}}} Multiply both sides by 21.
{{{10x = 21}}} Divide by 10.
{{{x = 2.1}}}
It would take them 2.1 hours or 2 hours and 6 minutes.