2014 AIME II Problems/Problem 1
Abe can paint the room in 15 hours, Bea can paint 50 percent faster than Abe, and Coe can paint twice as fast as Abe. Abe begins to paint the room and works alone for the first hour and a half. Then Bea joins Abe, and they work together until half the room is painted. Then Coe joins Abe and Bea, and they work together until the entire room is painted. Find the number of minutes after Abe begins for the three of them to finish painting the room.
From the given information, we can see that Abe can paint of the room in an hour, Bea can paint of the room in an hour, and Coe can paint the room in of the room in an hour. After minutes, Abe has painted of the room. Working together, Abe and Bea can paint of the room in an hour, so it takes then hours to finish the first half of the room. All three working together can paint of the room in an hour, and it takes them hours to finish the room. The total amount of time they take is
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