advanced algebra
posted by Sabrina .
ms. driva reck drove from her home to a service station at 48 km/h. she returned home by bike at 16 km/h. the entire trip took 4 hours. How far was the service station from ms. reck's home?

let the distance be x km
time driving = x/48
time biking = x/16
x/48 + x/16 = 4
times 48
x + 3x = 192
x = 48
Distance was 48 km
check: 48/48 + 48/16 = 1+3 = 4