When can we add 2 to 11 and get 1 as the correct answer?

What does this below rebus puzzle mean?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

What goes up but never comes down?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

What do you answer even though it never asks you questions?