A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days? Choose the correct answer.
A) 8 days
B) 12 days
C) 15 days
D) 16 days
E) 3.75 days
3.75 daysxplanation:   1/6 + 1/10 = 8/30 = 4/15   15/4= 
<gadget id="calculator">15/4</gadget>
<output>15/4 = around 3.75</output>
3.75 days   Answer 3.75 days
<result>E</result>
A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days?