What happened when the wheel was invented?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

O_er_t_o_

Complete the missing letters of the given word.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Find the hidden panda in the image below.

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?