B completes a work in 3 days. A alone can do it in 10 days. If both work together, the work can be completed in how many days?
Choose the correct choice:
A) 2.31 days B) 4.31 days C) 5.31 days D) 6.31 days E) 7.31 days
1/3 + 1/10 = 13/30   30/13 = 2.31 days   2.31 daysNSWER:2.31 days
<result>A</result>
B completes a work in 3 days. A alone can do it in 10 days. If both work together, the work can be completed in how many days?