# 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?

Correct result:

t =  14.25 d

#### Solution:

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

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