A can do a piece of work in 3 days of 5 hours each and B alone can do it in 5 days of 3 hours each.how long will they take it to do working together
3/4 hours a day?  Select.
A) 6 days B) 5 days C) 10 days D) 9 days E) 8 days
A's work per hour=1/15   B's work per hour=1/15   A &amp; B's work per hour together=(1/15)+(1/15)=2/15   so a &amp; B together complete the work in 15/2 hours...   if they work 2 1/2=5/2 hours a day,   it will take  (15/2)/(3/4)= 
<gadget id="calculator"> (15/2)/(3/4)</gadget>
<output>10</output>
10 days...   ANSWER: 10 days
<result>C</result>
A can do a piece of work in 3 days of 5 hours each and B alone can do it in 5 days of 3 hours each.how long will they take it to do working together
3/4 hours a day?