AMC 12 2015b Problem 2

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?

\textbf{(A)} \text{3:10 PM} \textbf{(B)} \text{3:30 PM} \textbf{(C)} \text{4:00 PM} \textbf{(D)} \text{4:10 PM} \textbf{(E)} \text{4:30 PM}