Final answer:
It would take 15,000 days or 1,296,000,000 seconds for 60,000 men to build a similar wall.
Step-by-step explanation:
To solve this problem, we can use the concept of man-hours. If it takes 4 men one day to build a wall, this means that it takes 4 man-hours to complete the wall. We can set up a proportion to find out how long it would take 60,000 men to build a similar wall:
4 men / 1 day = 60,000 men / x days
Cross multiplying, we get 4 * x = 60,000 * 1, which simplifies to x = 60,000 / 4 = 15,000 days.
To convert this into seconds, we multiply the number of days by 24 (24 hours in a day) and 60 (60 minutes in an hour), and then by 60 again to get the number of seconds. Therefore, it would take 15,000 * 24 * 60 * 60 = 1,296,000,000 seconds for 60,000 men to build a similar wall.