<PRE><B>Question 683872</B>
5 men take 10 days to fence an 18km fence.
Find how many man-days to complete the job
5 * 10 = 50 man-days
:
How long will it take 11 men to fence the same fence?
let d = no. of days required for 11 men to complete the job
11d = 50
d = 50/11 
d = 4.545 days
;
Give your answer in days and hours
Assume they are working 8 hr days
4 + .545(8) = 4 days 3.6 hrs</PRE>