If 5 men and 2 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time?
A). 1:3
B). 3:1
C). 1:2
D). 2:1
P is three times as fast as Q and working together, they can complete a work in 12 days. In how many days can Q alone complete the work?
A). 16 days
B). 20 days
C). 17 days
D). 12 days
A, B and C can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but C left 4 days before the completion of the work. In how many days was the work complete
A). 5 days
B). 4 days
C). 7 days
D). 11 days
A and B can do a work in 12 days, B and C in 30 days and C and A in 36 days. In how many days will the work be completed, if all three of them work together?
A). 160/11 days
B). 125/14 days
C). 180/13 days
D). 120/11 days
A, B and C can do a work in 6 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?
A). 2 2/3 days
B). 4 2/3 days
C). 1 2/3 days
D). 2 1/3 days