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Re: Working alone, Navid can mow [#permalink]
3
I went with the easy cumulative work formula (A + B) / (A * B)

for Quantity A: Navid + Steven = (2 + 12) / (2 * 12) = 14/24 = 7/12
for Quantity B: Erin + Janey = (3 + 4) / (3 * 4) = 7/12

answer C
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Re: Working alone, Navid can mow [#permalink]
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There is no need to remember a special formula.
Just this one: S = t*V (v - velocity as units per hour, t - time, S - units done)
N = 2h => V = 1/2
E = 3h => V = 1/3
S = 12h => V = 1/12
J = 4h => V = 1/4
S = 1 (1 - field) => 1 = t (1/2+1/12) => t=7/12
S = 1 => 1 = t(1/3 + 1/4) => t=7/12
The same
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Re: Working alone, Navid can mow [#permalink]
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lets look at the rates: 1/2 , 1/3, 1/4, 1/12 (assuming they are all working for one unit of work)

Thus 1/2 + 1/12 = 7/12
And 1/3 + 1/4 = 7 /12
Ans C

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Re: Working alone, Navid can mow [#permalink]
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