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A swimming pool is open for 7 1/2 hours during a day. The pool keeps one lifeguard on duty at a time, and each lifeguard's shift is 1 1/2 hours long.
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A swimming pool is open for 7 1/2 hours during a day. The pool keeps one lifeguard on duty at a time, and each lifeguard's shift is 1 1/2 hours long.

User Otboss
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7.5 divided by 1.5 is 5 so there are 5 lifeguards throughout the day.
User Bogdan Gusiev
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