A and B can finish a work in 10 days while A alone can do the same work in 20 days. In how many days B alone will complete the work?  Choose the correct option:
A) 20 days	B) 48 days	C) 98 days	D) 31 days	E) 22 days
B = 1/10 – 1/20 = 1/20 =&gt; 20 days   20 daysnswer: 20 days
<result>A</result>
A and B can finish a work in 10 days while A alone can do the same work in 20 days. In how many days B alone will complete the work?