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:

$$\begin{gathered} a=6\cdot 18=108 \\ b=a-3\cdot 6=108-3\cdot 6=90 \\ t=3+b\mathrm{/}(6+2)=3+90\mathrm{/}(6+2)={\displaystyle \frac{57}{4}}={\displaystyle \frac{57}{4}}\text{ d}=14.25\text{ d} \end{gathered}$$

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