Replace the question mark with the correct number in below Picture:

What type of tree can I carry in my hand?

81 x 9 = 801. What must you do to make the this equation true?

Identify the hidden meaning behind this picture?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I’m tall when I’m young, and I’m short when I’m old. What am I?

A police officer was passing by when he saw a guy hiding. He walked up to him and genially asked, "What is your name?"

"Shut up!" the boy responded.

"Where are your manners?" asked the outraged police officer.

"Up that tree," said the boy discourteously, directing to a neighbouring tree.

You're looking for trouble, aren't you?" said the police officer.

"No, trouble is looking for me!" the boy answered solemnly.

Why is the boy behaving like this?

Bobby and Wilbur decided to take their respective car out of the garage and race. None of them cheated and they both stood at the start time and decided to cover a distance in full throttle. The first to reach the mark was to be declared the winner.

Upon reaching the finishing mark, they found out that Bobby's car was 1.2 times faster than Wilbur's. Now, Wilbur had reached the mark about 1 minute and 30 seconds later than Bobby. Bobby's car reached the mark of 60 MPH on average.

Can you calculate the distance between the starting mark and the final mark with the help of the given data?