A can do a job in 30 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?	Choose the correct choice from the following options:
A) 14 days
B) 26 days
C) 30 days
D) 31 days
E) 39 days
30 days   1/30 + 1/30 = 1/15   15*2= 
<gadget id="calculator">15*2</gadget>
<output>30</output>
30 days
<result>C</result>
A can do a job in 30 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?