P is three times as fast as Q and working together, they can complete a work in 20 days. In how many days can Q alone complete the work? Choose one:
A) 26 1/2 days
B) 27 1/2days
C) 29 3/4days
D) 14 1/4 days
E) 10 1/2days
P = 3Q   P + Q = 3Q + Q = 4Q   These 4Q people can do the work in 20 days, which means Q can do the work in 80 days.   Hence, P can do the work in 26 1/2 days.   26 1/2 daysnswer:26 1/2 days
<result>A</result>
P is three times as fast as Q and working together, they can complete a work in 20 days. In how many days can Q alone complete the work?