P is three times as fast as Q and working together, they can complete a work in 10 days. In how many days can Q alone complete the work?
Choices:	A) 11 days	B) 16 days	C) 40 days	D) 15 days	E) 19 days
B   16 days   P = 3Q   P + Q = 3Q + Q = 4Q   These 4Q people can do the work in 10 days, which means Q can do the work in  4*10= 
<gadget id="calculator"> 4*10</gadget>
<output>40</output>
40 days.   Answer : 40 days
<result>C</result>
P is three times as fast as Q and working together, they can complete a work in 10 days. In how many days can Q alone complete the work?