Question 1171748
18 days*6hr/day*10 men=1080 man-hours for Rs1800 or 1.67 or (5/3) R per hour.
15*24*8=2880 man-hours
=4800 Rs after multiplying by 5/3.

or the second has 3/2*the men, working 4/3 more days at 4/3 more during a day, and that is 48/18 as much.
That *1800=4800.