David drives 40 miles in one hour. how many miles does he drive in 1.5 hours?

First you want to take the miles he drove and figure out how many miles a minute he drove, since there are 60 minutes in one hour we can then do 40 divided by 60 which would give us a unit rate of 0.6666666666666667 miles per minute, you would then multiply this unit number by the second time period which is one hour and 30 minutes; this looks like 0.6666666666666667 times 90, which would equal 60 miles in 1.5 hours... So david drives at a rate of 60 miles in 1.5 hours..