Joshua took a $$3$$ hours $$20$$ minutes train ride from Town $$X$$ to Town $$Y$$. The train departed at $$7:55$$ am, but stopped for $30$ minutes due to heavy rain during his trip. When did Joshua arrive in Town $$Y$$? (2009 Math kangaroo Problems, Level 3-4 , Question \#8) 
Overseas Competition->Knowledge Point->Combinatorics->Time Problem->Time Calculation
$7:55+ 3$ hours $$20$$ minutes=$11:15$  $11:15$+$30$ minutes=$11:45$ 