Wyznaczmy odpowiednie godziny.

$8.00\stackrel{40\text{min}}{\to }8.40$

$8.50\stackrel{10\text{min}}{\to }9.00\stackrel{30\text{min}}{\to }9.30$

$9.35\stackrel{25\text{min}}{\to }10.00\stackrel{15\text{min}}{\to }10.15$

$11.00\stackrel{-40\text{min}}{\to }10.20$

$11.05\stackrel{40\text{min}}{\to }11.45$

$12.35\stackrel{-35\text{min}}{\to }12.00\stackrel{-5\text{min}}{\to }11.55$

$12.40\stackrel{20\text{min}}{\to }13.00\stackrel{20\text{min}}{\to }13.20$

$14.55\stackrel{-40\text{min}}{\to }14.15$

$15.25\stackrel{35\text{min}}{\to }16.00\stackrel{5\text{min}}{\to }16.05$

$17.10\stackrel{40\text{min}}{\to }17.50$

Uzupełnijmy tabelkę:

Godzina rozpoczęcia egzaminu	$8.00$	$8.50$	$9.35$	$\boxed{10.20}$	$11.05$	$\boxed{11.55}$	$12.40$	$\boxed{14.15}$	$15.25$	$\boxed{16.30}$
Godzina zakończenia egzaminu	$\boxed{8.40}$	$\boxed{9.30}$	$\boxed{10.15}$	$11.00$	$\boxed{11.45}$	$12.35$	$\boxed{13.20}$	$14.55$	$\boxed{16.05}$	$17.10$