P is three times as fast as Q and working together, they can complete a work in 36 days. In how many days can Q alone complete the work? Choose the correct choice.
A) 16 B) 48 C) 88 D) 55 E) 778
P = 3Q   P + Q = 3Q + Q = 4Q   These 4Q people can do the work in 36 days, which means Q can do the work in 144 days.   Hence, P can do the work in 48 days.   Answer:48
<result>B</result>
P is three times as fast as Q and working together, they can complete a work in 36 days. In how many days can Q alone complete the work?