单项选择题

A certain company has found that the number of labor hours required to produce x items is directly proportional to the square root of x．If 3 labor hours are required to produce 20 items，how many labor hours are required to produce 40items？（）

A.A
B.B
C.C
D.D
E.E

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单项选择题

A company paid $500，000 in merit raises to employees whose performances were rated A，B，or C．Each employee rated A received twice the amount of the raise that was paid to each employee rated C；each employee rated B received times the amount of the raise that was paid to each employee rated C．If 50 workers were rated A，100 were rated B，and 150 were rated C，how much was the raise paid to eachem ployee rated A？（）

A. $370
B. $625
C. $740
D. $1，250
E. $2，500

单项选择题

A speed of 30 miles per hour is equivalent to a speed of 44 feet per second．A speed of33 feet per second is equivalent to a speed（）

A、if the quantity in Column A is greater;
B、if the quantity in Column B is greater;
C、if the two quantities are equal;
D、 if the relationship cannot be determined from the information given.