Riddle: It takes ten men ten hours to build a certain wall. How long does it take five men to build the same wall?

Question

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

Answer 1

No time.........................as the wall is already Built.....................

Answer 2

20 hours

1 wall/10 men=1/10 wall per man
1/10 wall per man/10 hours=1/100 wall per man per hour
5 men x 1/100 wall per man per hour=5/100 or 1/20 wall per hour
1 wall/ 1/20th wall per hour =20 hours per wall
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Answer 3

I think 20 Hours ?