Problem $6$:

Observers stationed at two sections $xx$ and YY$,900ft$ apart on a highway, record the arrival times of five vehicles as shown in the accompanying table. If the total time of observation at $xx$ was $90$ sec$,$ determine $($a$)$ the time mean speed, $($b$)$ the space mean speed, and $($c$)$ the flow at section XX in vehicles per hour. Because we want to study this specific $900-$foot section, $($d$)$ which mean type is more relevant?

$\backslash$table$[[$Vehicle$,$Section XX$,$Section YY$],[$A$,$T$\_(0),$T$\_(0)+15\mathrm{.}2$sec$],[$B$,$T$\_(0)+10\mathrm{.}1$sec$,$T$\_(0)+26\mathrm{.}4$sec$],[$C$,$T$\_(0)+32\mathrm{.}3$sec$,$T$\_(0)+47\mathrm{.}7$sec$],[$D$,$T$\_(0)+52\mathrm{.}8$sec$,$T$\_(0)+68\mathrm{.}1$sec$],[$E$,$T$\_(0)+71\mathrm{.}6$sec$,$T$\_(0)+85\mathrm{.}9$sec$]]$