A and B complete a work in 50 days. A alone can do it in 40 days. If both together can do the work in how many days? Choose the most appropriate option.
A) 1.075 days	B) 0.185 days	C) 0.065 days	D) 0.045 days	E) 0.0775 days
1/50 + 1/40= 
<gadget id="calculator">1/50 + 1/40</gadget>
<output>9/200 = around 0.045</output>
0.045 days   ANSWER:0.045 days
<result>D</result>
A and B complete a work in 50 days. A alone can do it in 40 days. If both together can do the work in how many days?