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Weekly Mind Bender

In a school, three rings of a bell indicate recess time. Most of the students try to get from their classroom to the schoolyard before the third ring of the bell.  There is a ten-second interval between each ring.

If two seconds are used to store their books, how much time is available to reach the schoolyard before the third bell rings?

18 seconds

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Weekly Mind Bender

Mr. Black, Mr. Brown and Mr. Green are eating at a restaurant.
Each is wearing a coloured tie.  The ties are black, brown and green in colour.

Suddenly the man wearing the green tie says :
“Did you notice that our ties are the same colour as our names but no one is wearing a tie similar to his name?”  “Strange, indeed,” says Mr. Black.

Question:  What colour tie was each man wearing ?

Mr. Black = brown,
Mr. Brown = green,
Mr. Green = black