Sharon and ken drove to the service station at 60km/h. they returned home on a bicycle at 15km/h. the entire trip took 4 hours. how far was the round trip?

Sharon and Ken drove to the service station - x hours.
They returned home - y hours.

60x - distance from home to the service station.
15y - distance from the service station to the home.

60x =15y > y = 4x

x+y = 4(hours)

x+y = 4
y=4x

x+4x=4
5x=4
x=4/5 h=0.8h

y=4x > y=4*(4/5)=16/5 =3.2h

60x=0.8*60=48 km
15y=15*3.2= 48 km

48 km.

The answer to your question is 48km