William cycles at a speed of 15 miles per hour. he cycles 12 miles from home to school. If he increases his cycling speed by 5 miles per hour, how much faster will he reach his school?
the time will be 48 because 54=20, so 124=48 now william reaches faster 20 miles that 20-5=15 53=15 so 123=36 therefore william reaches school 12 minutes faster.
