If it took eight men ten hours to build a wall, how long would it take four men to build it?

Solve the puzzle by telling what does below picture means.

Our product and our sum always give the same answer. Who are we?

What is next number in the pattern below:

131 517 192 123 ?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

What word does this rebus represent?

meta meta
meta meta

Can you count the number of blocks in the picture below?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?