You just competed in a track meet and you ran the 1500 m race in 455 s. What was your average speed in miles per hour?

Answer 1

1 mile = 1609 m

1 hour = 3600 s

1500 m = (1500 / 1609) miles

455 s = (455 / 3600) hr

So speed in miles per hour = miles / hours = (1500 / 1609) / (455/3600) = (1500 x 3600) / (1609 x 455) = 7.38 mph