What Time Should the last watch show in the below figure?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What does this mathematical rebus means ?

What does this mean?

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There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Which country gets ill every time?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Can you count the number of squares in the given picture?

Replace the question mark in the picture below.

What can go up a chimney down, but can’t go down a chimney up?