Is Half a mile in 30 seconds fast? Why?

There are 60 minutes in an hour and 60 seconds in a minute.

60 * 60 = 3600

There are 3600 seconds in an hour.

3600/30 = 120

3600 seconds is 120 times 30 seconds.

If you go 1/2 mile in 30 sec, you go 120 times more distance in 1 hour.

1/2 mile * 120 = 60 miles

1/2 mile in 30 sec is the same as 60 miles per hour.