Why do people go to bed?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What 5-letter word typed in all capital letters can be read the same upside down?

Which part of London exists in France as well ?

Prove that the below maths equation is true.

8 + 8 = 91

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What is the fastest way to double your money?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Find the smallest sentence with all the English alphabet.