A can do a piece of work in 5 days of 9 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
2 1/4 hours a day?
Choose the correct choice
A) 2 days B) 3 days C) 4 days D) 5 days E) 6 days
A's work per hour=1/45   B's work per hour=1/15   A &amp; B's work per hour together=(1/45)+(1/15)=4/45   so a &amp; B together complete the work in 45/4 hours...   if they work 2 1/4=9/4 hours a day,   it will take  (45/4)/(9/4)= 
<gadget id="calculator"> (45/4)/(9/4)</gadget>
<output>5</output>
5 days...   ANSWER:5 days
<result>D</result>
A can do a piece of work in 5 days of 9 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
2 1/4 hours a day?