GRE Question of the Day (October 20th)

Math

A plumber is twice efficient than his apprentice. After the plumber has worked alone for $2$ hours, his apprentice joins him and working together they complete the job $3$ hours later.

Quantity A	Quantity B
Number of hours required for apprentice alone to finish the job	10

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

Correct Answer - A - (click and drag your mouse to see the answer)

Question Discussion & Explanation