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?
1PM - 2:40PM = 100 minutes
So.....each task takes 50 minutes
And the third task lasts 50 minutes, too.....so
2:40PM + 50 minutes = 3:30 PM is when the last task is completed....
