Some physics kids were testing some changes they made to make their bikes go faster. theyposted the following speeds on the class whiteboard. who went the fastest? scot went 15,000 m/hr george went 15 km/hr fred went 4.3 m/s may went 13 km/hr

To do this, you need to make sure that all speeds are the same unit. Since there are three 2 speeds already in km/hr, it would be best that you match the other 2 speeds into that unit as well. 

Conversion of 15,000m/hr:
time is already in hours so you just need to make convert the meters to kilometers. 



Conversion of 4.3m/s


Now that they are all the same value, you can see that Fred at 4.3m/s  was the fastest.