SOLUTION: A contractor agrees to lay a road 3000 m long in 30 days. 50 men are employed and they work for 8 hours say. After 20 working days, he finds that only 1200 m of the road is comple

Question 1036554: A contractor agrees to lay a road 3000 m long in 30 days. 50 men are employed and they work for 8 hours say. After 20 working days, he finds that only 1200 m of the road is completed. How many more men does he need to employ in order to finish the project on time if each man now works 10 hours a day?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A contractor agrees to lay a road 3000 m long in 30 days.
50 men are employed and they work for 8 hours say. After 20 working days, he finds that only 1200 m of the road is completed.
:
Find the number of man-hrs required to complete 1200 meters
50*8*20 = 8000 man-hrs
Find the no. of meters per man-hr
= .15 meters per per man-hr
:
How many more men does he need to employ in order to finish the project on time if each man now works 10 hours a day?
Find how many man-hr required to do the remaining 1800 meters
= 12000 man-hrs
let m = no. of additional men required to accomplish this in 10 days working 10 hrs a day
10*10*(m+50) = 12000
100m + 5000 = 12000
100m = 12000 - 5000
100m = 7000
m = 7000/100
m = 70 more men
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