If 5 men and 2 boys working together, can do three 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?  Choose the correct choice from the following.
A) 3:2
B) 2:1
C) 3:3
D) 1:2
E) 6:1
5M + 2B = 3(1M + 1B)   5M + 2B = 3M + 3B   2M = 1B   The required ratio of work done by a man and a boy = 1:2   1:2
<result>D</result>
If 5 men and 2 boys working together, can do three 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?