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 lifeguards shift is one and a half hours long how many shifts are there per day
The answer is 5 people because 7hrs and 30mins is like 450 mins together so then 1hr and 30min of their shift is 90 mins so divide 450 by 90 is 5 people work each day
