2015 AMC 10B Problem 2

Problem 2 of 25EasierAlgebra

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?

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Solution

The time it takes to do

2

tasks is

100

minutes. Thus, it takes

50

more minutes after

2:40,

which is

3:30.

Thus, the correct answer is B .

Concepts: date and time

Problem text and solution from the LIVE past-contest archive. See also the AoPS wiki page for community solutions.