Question 180686
In words:
Let {{{x}}}= number of hours for Jim, Sue, and Tony to
fill pool working together
Jim's rate of filling + Sues rate of filling + Tony's rate of filling =
rate of all 3 filling pool together
{{{1/.5 + 1/.75 + 1/1.5 = 1/x}}}
Multiply both sides by {{{1.5x}}}
{{{3x + 2x + x = 1.5}}}
{{{6x = 1.5}}}
{{{x = .25}}} hr
All 3 filling pool together can do the job in 15 min