If it took eight men ten hours to build a wall, how long would it take four men to build it?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

When is the top of a mountain similar to a savings account?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Find the number of squares in the below-given picture.

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

People put me on the table and cut me but do not eat me. What am I?

What kind of band never plays music?