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

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

Take one out and scratch my head, I am now black but once was red. What am I?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

A bomb exploded in a room full of married couples and no one died. How?

Make a sentence consisting of three words that have the whole alphabet.

Can you find the missing piece of the Porsche?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?