Roy can build a dog house in 4 hours, while Dominic can do the same in 6 hours. They started working together at 8am. What time will they finish?
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Roy can build a dog house in 4 hours, and he started working at 8 am. So, he will finish at 8 am + 4 hours = 12 noon.
Dominic can build a dog house in 6 hours, and he started working at 8 am. So, he will finish at 8 am + 6 hours = 2 pm.