Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What has hands, but can’t clap?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Count the number of triangles in the given picture.

Find the next number in the sequence

5 12 24 36 ?

Give it food and it will live; give it water and it will die.

If six children and two dogs were under an umbrella, how come none of them got wet?