A $5 \mathrm{m}$ wide cloth is used to make a conical tent of base diameter $14 \mathrm{m}$ and height $24 \mathrm{m}$. If the cost of cloth used, at the rate of $₹25$ per metre is $₹x$, then write the value of $x$.

Three cubes of a metal whose edges are in the ratio $3:4:5$ are melted and converted into a single cube whose diagonal is $12\sqrt{3} \mathrm{cm}$. 

Find the sum of edges of the three cubes (in cm).