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Wide-angle problem in fourth grade mathematics
Boiling 1 min; Cook porridge 16 minutes

Wash salted duck eggs for 3 minutes and cook porridge at the same time; Boil salted eggs 10 minute (3 minutes earlier than porridge)

When cooking porridge and salted eggs

Wash your hair for 5 minutes, brush your teeth and wash your face for 6 minutes and comb your hair for 2 minutes;

* * * Time: 1+ 16= 17 minutes.