b)

$11:{16}_{:18}\stackrel{\text{6 godzin}}{\to }17:{16}_{:18}$    

 

52 minuty to 44 minuty i 8 minut.

$17:{16}_{:18}\stackrel{\text{44 minuty}}{\to }18:{00}_{:18}\stackrel{\text{8 minuty}}{\to }18:{08}_{:18}$