Renu can do a piece of work in 6 days, but with the help of her friend Suma , she can do it in 4 days. In what time Suma can do it alone?	Choose the correct option:
A) 10	B) 12	C) 14	D) 15	E) 17
Renu’s one day’s work = 1/6   Suma’s one day’s work = 1/4 - 1/6 = 1/12   Suma can do it alone in 12 days.   ANSWER:12
<result>B</result>
Renu can do a piece of work in 6 days, but with the help of her friend Suma , she can do it in 4 days. In what time Suma can do it alone?