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,
$\frac32=\frac{220}{8\times3\times d}$
$\implies d=\frac{55}9=6.12$
True, the Tejas blamed the Spaniards for an outbreak of deadly disease. The Spanish started to colonize there bring diseases over with them, and as Indians gave them land they gave new and unknown elements to the land like the pilgrims did.
It's (D), Colonists had to struggle to grow enough food to meet their needs.
The amount of African Americans holding public office rose.
