Emile wants to win the 100 yard dash at the track meet If he

Emile wants to win the 100 yard dash at the track meet. If he runs 4.9 miles per hour, how many minutes will it take him to run the race?

Solution

Rate*Time=Distance
Make sure your units are consistent.
Convert all lengths to feet.
1 mile=5280 feet
4.9 miles/hr=4.9(5280 ft)/hr=25872 ft/hr*(1 hr/3600 sec)=7.187 ft/sec
100 yd=300 feet
Time=Distance/Rate
t=300 ft/(7.187 ft/sec)=41.7 sec
You want the answer in minutes though.
t=41.7 sec(1 min/60 sec)=0.696 minutes