Hello User,
Answer/Step:
1 mile = 5280 ft...so 90 miles = 90 * 5280 = 475200 ft
60 seconds in 1 minute...and 60 minutes in 1 hr = 60 * 60 = 3600 sec/hr
475200/3600 = 132 ft per second...so 90 miles per hr = 132 ft per second.
so the pitcher on the Robins throws faster at 132 ft/sec compared to the Bluebirds pitcher who throws at 121 ft/sec
