Question 902125
{{{(1/(x-20)) + 1/x = 1/24}}} |Multiplying thru by 24x(x-20) so as all denominators = 1
  24x + 24(x-20) = x(x-20)
x^2 -68x + 480 = 0   (Tossing out erroneous solution)
(x-60)(x-8) = 0
x = 60min