How many triangles are there on the puzzle below?

What is harder to catch the faster you run?

What does this rebus mean?

O
N
C
E
TIME

Which five letter word can be added at the end of below word to form a
valid word?

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You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

Can you decipher the below rebus?

PBLUESAISNUERSES

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you start the fire using two pieces of wood?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?