What is so fragile that saying its name breaks it?

Can you place six X (crosses) in below board without making three in a row in any way ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

Solve the mathematical equation in the picture below.

Prove that the below maths equation is true.

8 + 8 = 91

What do you call a fish without an eye?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?