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

Find the next number in the sequence

1, 2, 6, 21, 88, __?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Decode this picture on T-Shirt and tell what it says ?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

How can one talk without saying a single word?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has many teeth, but cannot bite?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?