Natalie arrived at her friend\textquotesingle s birthday party at $$12.40$$ p.m.  She stayed there for $$2$$ hour and $$40$$ minutes. What time did Natalie leave the party? 
Overseas Competition->Knowledge Point->Counting Modules->Permutations and Combinations->Combinations Overseas Competition->Knowledge Point->Combinatorics->Time Problem->Time Calculation