1 hour for 4 men means that the wall takes 4 man hours of work.
i.e. it would take 1 man 4 hours (1 x 4 = 4 hrs) or 2 men 2 hours (2 x 2 = 4 hrs), etc. So it would take 5 men '4 divided by 5' hours. This equals 48 minutes. (5 x 48 mins = 4hrs).

Answer #2 | 31/12 2013 02:51

mathematically 4/5 hrs
logically no time at all because the wall is already built.
TEEHEE

Answer #3 | 31/12 2013 02:51

2 answers
Trick Question answer
0 hours the 4 workers already finished it.
Maths answer
If it takes 1 hour for 4 workers to complete the wall it would take 1 worker 4 hours to do it by himself.
Therefore 5 workers would take 4 hours / 5 to complete the wall
4/5 of an hour = 4/5 * 60 minutes = 48 minutes
Answer 48 minutes

Answer #1| 31/12 2013 02:48