What does this Rebus Picture mean?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you count the number of lines in the below picture?

Do you know who was buried in John's tomb?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What number should come in place of the question mark below?

What is both possible and impossible at the same time?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?