Hello there, I hope you are having a great day :) Your Question: John was swimming for an hour and a half hours at a speed of 2 miles per hour.How far did he swim? So the answer would be that 1 Hour = 2 miles and then do 1/2 hours = 2 divide 2 miles 1 and 1/2 hours = 2 + 1 Miles so 1 and 1/2 Hours = 3 miles so john swim 3 miles.
Hopefully that helps you :)