<PRE><B>Question 591084</B>
15 labourers can lay 85 metres of cable in 10 days. How long will it take
a) 12 labourers to ly 85 metres of cable?
b) 8 labourers to lay 100 metres of cable?
----------------
15 labourers can lay 85 metres of cable in 10 days.
85 metres = 15*10 man-days = 150 man-days
--------
a) 12 labourers to ly 85 metres of cable?
150 man-days/12 men = 12.5 days
----------
b) 8 labourers to lay 100 metres of cable?
-----
= (100/85)*(12/8) = 1200/340 days
=~ 35.29 days</PRE>