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 10 hours a day? Answers:  A) 28.8  B) 30  C) 32  D) 34  E) 36
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*10= 
<gadget id="calculator">20*10</gadget>
<output>200</output>
200   Therefore number of days=5760/200= 
<gadget id="calculator">5760/200</gadget>
<output>144/5 = around 28.8</output>
28.8 days   28.8ns=28.8
<result>A</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 10 hours a day?