A secondary source is a experience heard by a primary. pick the one using this definition
assuming efficiency of each man to dig trench, in one day, for one hour is constant,

so one man, working for one hour in one day can dig 1.5 m
so 8 men, working 3 hours a day and will take, say $d$ number of days and efficiency will be constant. so,
$\frac32=\frac{220}{8\times3\times d}$
$\implies d=\frac{55}9=6.12$
The author of this excerpt is presenting an argument for Japan to follow a policy of "<span>(4) economic imperialism" since there are so few other options available. </span>
Answer:
Economic Impact: labor systems, money, levels of Technology
Political Impact: war, loyalty to leader, state control of trade
Social/ Culture Impact: social class, family order, gender relations, and religious influences
hoped it helped!!!
Explanation: