Question

It takes 5 men 3.5 hours to build a wall. Work out how long it takes 4 men to build the same wall, giving your answer in hours and minutes.​

Answer 1

I think the answer is 3 hours and 20 minutes or 3.2 hours.

Answer 2

4 men takes 4 hours 22.5 minutes to build the same wall

Explanation:

5 men takes 3.5 hours

1 men will take ( 5 * 3.5 ) = 17.5 hours

so 4 men shall take ( 17.5 / 4 ) = 4.375 hours = 262.5 minutes

4 men takes 4 hours 22.5 minutes