A can do a piece of work in 7 days of 9 hours each and B alone can do it in 6 days of 7 hours each.how long will they take it to do working together
8 2/5 hours a day? Choose the correct choice from the following options
A) 3 days  B) 4 days  C) 5 days  D) 6 days  E) 7 days
A's work per hour=1/63   B's work per hour=1/42   A &amp; B's work per hour together=(1/63)+(1/42)=5/126   so a &amp; B together complete the work in 126/5 hours...   if they work 8 2/5=42/5 hours a day,   it will take (126/5)/(42/5) days=(126/5)*(5/42)= 
<gadget id="calculator">(126/5)*(5/42)</gadget>
<output>3</output>
3 days...   3 daysNSWER:3 days
<result>A</result>
A can do a piece of work in 7 days of 9 hours each and B alone can do it in 6 days of 7 hours each.how long will they take it to do working together
8 2/5 hours a day?