A and B complete a work in 20 days. A alone can do it in 40 days. If both together can do the work in how many days? Choose the correct choice from the following choices:
A) 1.0875 days  B) 0.1875 days  C) 0.0675 days  D) 0.075 days  E) 0.0175 days
1/20 + 1/40= 
<gadget id="calculator">1/20 + 1/40</gadget>
<output>3/40 = around 0.075</output>
0.075 days   ANSWER:0.075 days
<result>D</result>
A and B complete a work in 20 days. A alone can do it in 40 days. If both together can do the work in how many days?