Math and Logic

Taking Their Time

Three brothers threw a party, and now they need to clean up. Working alone, Paul would clean the whole house in 3 h,\SI{3}{\hour}, Robert in 4 h\SI{4}{\hour} and Sam in 5 h.\SI{5}{\hour}. If they join forces, how long will the cleaning take them? Keep reading to find out, or jump straight to today's challenge if you're ready.

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