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prealgebra senior

Problem

Marie does three equally time-consuming tasks in a row without taking breaks. She begins the first task at 1:00 PM and finishes the second task at 2:40 PM. When does she finish the third task?
(A)
(B)
(C)
(D)
Solution
The first two tasks took minutes. Thus, each task takes minutes. So the third task finishes at minutes .
Final answer
B