SOLUTION: Katie ran 3 miles in 30 minutes. What was Katie's average speed in feet per second

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Katie ran 3 miles in 30 minutes. What was Katie's average speed in feet per second       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 869756: Katie ran 3 miles in 30 minutes. What was Katie's average speed in feet per second

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
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 8.8 feet per second