During which month do people sleep the least?

Can you name four days which start with the letter 'T'?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

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?

Our product and our sum always give the same answer. Who are we?

Buy me, smell me or deliver me, I do not change.

Who am I?

It is always ahead of me yet I can never see it. What is it?

What is at the end of a rainbow?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?