Question

Christopher swim laps every day in town swimming pool swim 45 minutes each day five days each week for 12 weeks and that time to swim 1800 laps what was his average rate in laps per hour

Answer 1

Ok

in 1 day he swims 45 minutes and does 1800 laps

`1Day=45Minutes=xlaps`

for 5 days a week he swims 45*5 and does x*5 laps

`5Days=225Minutes=x\ast5laps`

for 12 weeks he swims 12*(225) and does x*5*12

`12weeks=12\ast5Days=12\ast225Minutes=x\ast5\ast12laps=1800laps`
`12weeks=60Days=2700minutes=60xlaps=1800laps`

now in 2700 minutes he does 1800 laps

`(1800)/(2700)=(2)/(3)`

that means that in 1 minute he does 2/3 of a lap

then

in 60 minutes he does 60*(2/3)=40

then in 1 hour Christopher swams a avarage rate of 40 laps per hour