Water flows smoothly through a pipe with various circular cross$-$sections of diameters $2$D$,6$D$,$ and D$,$ respectively.

$-$ Part $($a$)$

In which section is the volume flow rate largest? Choose the best answer.

$$They are the same.$$Correct$!$

$-$ Part $($b$)$

In which section is the speed of the water largest? Choose the best answer.

$$Section $3$Correct$!$

$$ Part $($c$)$

What is the ratio of the speed in section $3$ to the speed in section $1?$

V$3/$V$1=$

$|$