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

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Question 1078852: A contractor agrees to lay a road 3000m long in 30 days. 50 men are employed and they work for 8 hours per day. After 20 working days, he finds that only 1200m 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 hrs a day?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
Work-rates nR*T=W for work W, n workers, R rate for one worker, time T.

If keep the time units as HOURS, then the fifty workers for twenty DAYS were as
50r%2A8%2A20=1200

r=%283%2F20%29%28METERS%2FHOURS%29


Now the contractor wants to be sure to finish in 10 days at 10 hours per day, and wants to know many more workers to hire. Length needing to be done is 3000-1200=1800 meters.

%28n%2B50%29%283%2F20%29%2810%2A10%29=1800

n=70
Need to hire 70 more workers

Answer by MathTherapy(10549) About Me  (Show Source):
You can put this solution on YOUR website!
A contractor agrees to lay a road 3000m long in 30 days. 50 men are employed and they work for 8 hours per day. After 20 working days, he finds that only 1200m 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 hrs a day?
It will take a total of 72 men, or an highlight_green%28matrix%281%2C3%2C+Extra%2C+22%2C+men%29%29 to complete the remaining 3%2F5 of the work, in 10 days, working 10 hours per day.