X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days how long will they work together take to complete the work?
Choose the correct choice from the following choices.
A) 13 1/3 B) 15 C) 20 D) 56 E) 57
Explanation:   Work done by x in 8 days= 8/40 = 1/5   remaining work= 4/5   4/5 work is done by Y in 16 days   whole work is done by Y in   16*5/4= 
<gadget id="calculator">  16*5/4</gadget>
<output>20</output>
20 days   X’s 1 day work=1/40   Y’s 1 day work =1/20   (X+Y)’s 1 day work=1/40 +1/20 = 3/40 = 13 1/3   13 1/3nswer: Option 13 1/3
<result>A</result>
X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days how long will they work together take to complete the work?