Question 666541
Rate(farmer): {{{3(1/x)}}}
Rate(son): {{{1/x}}}
Rate(together): {{{1/6}}}
...
{{{3(1/x) + (1/x) = (1/6)}}}
Multiply the entire equation by 6x
{{{6cross(x)(3/cross(x)) + 6cross(x)(1/cross(x)) = cross(6)x(1/cross(6))}}}
18 + 6 = x
...
x = 24
...
Rate(farmer): {{{3(1/24) = 1/8}}} {{{highlight_green(8 hours)}}}
Rate (son): {{{1/24}}} {{{highlight_green(24 hours)}}}

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