Question

If $5$ men can paint a wall $100$ metres long in $10$ days of a $8$ hours each. In how many days of $6$ hours each will $8$men paint a wall $30$ metres long?

• A. $10$
• B. $5$
• C. $2.5$
• D. $1.5$

Answer 1

Answer: (C)

$2.5$

Total hours in $10$ days $=10\times 8=80$ hours
Total man-hours needed for paint 100 m wall $=5\times 8=40$ man-hours.
Man-hours needed for 1 meter wall painting$=400/100=4$ man-hour.
Now,
$30\times 4=120$ m-h to do $30$ meters.
$120$ m-h$/8$ men $=$ $15$ hours
$15$ hr$/6$ hr$/$day =$2.5$ days.