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prealgebra junior

Problem

Marie does three equally time-consuming tasks in a row without taking breaks. She begins the first task at PM and finishes the second task at PM. When does she finish the third task?
(A)
(B)
(C)
(D)
Solution
Marie finishes tasks in hour and minutes. Therefore, one task should take minutes to finish. minutes after PM is PM, so our answer is
Final answer
B