Highway

Six trucks will be used to build the roadside 18 days. After 3 days, two more trucks were sent to build. How long will it take for material move?

Result

t =  14.25 d

Solution:

a=6⋅ 18=108 b=a−3⋅ 6=108−3⋅ 6=90 t=3+b/(6+2)=3+90/(6+2)=574=14.25=14.25  d a = 6 \cdot \ 18 = 108 \ \\ b = a-3 \cdot \ 6 = 108-3 \cdot \ 6 = 90 \ \\ t = 3+b/(6+2) = 3+90/(6+2) = \dfrac{ 57 }{ 4 } = 14.25 = 14.25 \ \text{ d }

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