Question 869756
3 miles in 30 minutes = 3 miles in 0.5 hour



D = r*t



3 = r*0.5



3/0.5 = r



6 = r



r = 6



Her speed in miles per hour is 6 mph.



Now you use these equations



1 mile = 5280 feet
1 hour = 60 min
1 min = 60 seconds


to set up conversion factors to convert miles/hour to feet/second



6 mph = (6 miles/hour)*(5280 feet/1 mile)*(1 hour/60 min)*(1 min/60 seconds)



6 mph = (6)*(5280)*(1/60)*(1/60) feet/second



6 mph = 8.8 feet/second



Her speed is <font color="red">8.8 feet per second</font>