To asphalt 1km road, 30 men spent 12 days working 8 hours per day. How many days, 20 men will spend to asphalt a road of 2km working 8 hours a day?
Select.
A) 40  B) 36  C) 42  D) 44  E) 46
Man-hours required to asphalt 1 km road=30*12*8= 
<gadget id="calculator">30*12*8</gadget>
<output>2_880</output>
2880   Man-hours required to asphalt 2 km road=2880*2= 
<gadget id="calculator">2880*2</gadget>
<output>5_760</output>
5760   Man-hours available per day=20*8= 
<gadget id="calculator">20*8</gadget>
<output>160</output>
160   Therefore number of days=5760/240=36 days   Ans=36
<result>B</result>
To asphalt 1km road, 30 men spent 12 days working 8 hours per day. How many days, 20 men will spend to asphalt a road of 2km working 8 hours a day?