B completes a work in 9 days. A alone can do it in 10 days. If both work together, the work can be completed in how many days?	Answers.
A) 3.75 days	B) 4.73 days	C) 5.75 days	D) 6.75 days	E) 7.73 days
1/9 + 1/10 = 19/90   90/19 = 4.73 days   ANSWER: 4.73 days
<result>B</result>
B completes a work in 9 days. A alone can do it in 10 days. If both work together, the work can be completed in how many days?