Question 233275
Elisa walked a certain distance at 5mph and then jogged twice that distance at 8 mph. 
Her total time walking and jogging was 2 hours and 15 minutes. 
How far did she get?
---
Walking DATA:
rate = 5 mph ; distance = x miles ; time = d/r = x/5 hrs.
------------------------------------------
Jogging DATA:
rate = 8 mph ; distance = 2x miles ; time = (2x)/8 hrs.
-------------------------------------------
Equations:
time + time = 2.25 hrs
x/5 + (2x)/8 = 9/4 hrs
Multiply thru by 20 to get:
4x + 5x = 5*9
x = 5 miles 
---
Total distance: x + 2x = 5+10 = 15 miles
===========================================
Cheers,
Stan H.