First convert yards to feet, there are 3 feet in a yard so it's just 54x3 which is 162 ft, the convert seconds to minutes so the zebra ran for 135 seconds with 60 seconds in a minute meaning it ran for 135/60 which is 2.25 minutes, then just divide the feet over the minutes to solve ft/min so 162/2.25 gives you 72, which means the answer is just 72ft/minute
