Five parallel plates form a solar collector that covers a roof, as shown in the figure. The

plates are maintained at $20$C$,$ while ambient air at $10$C flows over the roof with V $=3$

m$/$s$.$ Each plate had $1$ m length and $4$ m width. Determine the rate of convective heat loss

from $($a$)$ the first two plates $($x $=0$ ~ $2$ m$)$ and $($b$)$ the third plate $($x $=2$ ~ $3$ m$).($Hint: heat

transfer by the third plate $=$ heat transfer from the first three plates $$ heat transfer from

the first two plates $($answer of $($a$))$