Question

can someone PLEASE take a look at the attached pictures and help me with at least just one question? I would really appreciate it!! thanks :)

Answer 1

@Luigi0210 @SolomonZelman @magepker728

Answer 2

@e.mccormick @iambatman

Answer 3

\(\large \begin{align} \color{black}{\normalsize \text{Tunnel question}\hspace{.33em}\\~\\
\normalsize \text{let us assume the total work is drilling 12 km tunnel}\hspace{.33em}\\~\\
\normalsize \text{let first driiling machine takes 4 yrs to drill 12 km tunnel}\hspace{.33em}\\~\\
\normalsize \text{let second driiling machine takes 3 yrs to drill 12 km tunnel}\hspace{.33em}\\~\\
\normalsize \text{Work done by first machine in 1 yrs}=\dfrac{12}{4}=3~km/yr\hspace{.33em}\\~\\
\normalsize \text{Work done by second machine in 1 yrs}=\dfrac{12}{3}=4~km/yr\hspace{.33em}\\~\\
\normalsize \text{Work done by first and second machine }=4+3=7~km/yr\hspace{.33em}\\~\\
\normalsize \text{Work done by both machine in 1/7 yrs}=1~km\hspace{.33em}\\~\\
\normalsize \text{Work done by both machine in 12/7 yrs}=12~km\hspace{.33em}\\~\\
\implies \dfrac{12}{7} \approx 1.71~~yrs \hspace{.33em}\\~\\
}\end{align}\)

Answer 4

The rest seems physics questions, try to post in that section