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,
$\frac32=\frac{220}{8\times3\times d}$
$\implies d=\frac{55}9=6.12$
Wait what? What is this about lol
<h3>
Answer:</h3>
A. It practiced ruthless business techniques.
C. It dominated the oil market.
D. It controlled the transportation of oil.
<h3>
Explanation:</h3>
Standard Oil managed the oil goods market originally through smooth combination in the refining area, then, in later years upward combination; the organization was an innovator in the advancement of the industry business. The Standard Oil trust streamlined generation and logistics reduced values, and undermine opponents. "Trust-busting" experts prosecuted Standard Oil of practicing offensive pricing to crush opponents and form a merger that warned other industries.
