Question 374130
Let x = #minutes for Gunther, so x + 28 = #minutes for Gerta.  The equation:
{{{48(1/x + 1/(x+28)) = 1}}},
Simplifying, 
{{{48((x+28+x)/(x(x+28))) = 1}}},
{{{48(2x+28) = x(x+28)}}}, after combining terms and cross-multiplying.
{{{96x + 1344 = x^2 + 28x}}},
{{{x^2 -68x - 1344 = 0}}},after combining terms and transposing,
(x - 84)(x + 16) = 0, after factorization.
This gives x = 84 (eliminate x = -16)
Therefore Gunther takes 84 minutes to peel a bushel of potatoes, while 
Gerta can peel a bushel in 112 minutes.