Question 157307
In words:
(rate for pipe #1) + (rate for pipe #2) = combined rate
or
(1 tank / 6 hours) + (1 tank / 8 hours) = 1 tank / x hours)
{{{1/6 + 1/8 = 1/x}}}
{{{x*(1/6 + 1/8) = 1}}}
{{{x*(4/24 + 3/24) = 1}}}
{{{x*(7/24) = 1}}}
{{{7x = 24}}}
{{{x = 3.43}}}hrs answer