Question 970647
D=RT
198=(52X)+(60*(3.5-X))
198=52X+210-60X
210-198=60X-52X
12=8X
X=12/8
X=1.5 HOURS F0R THE 52 MPH  TRIP.
3.5-1.5=2 HOURS FOR THE 60 MPH TRIP.
PROOF:
198=52*1.5+60*2
198=78+120
198=198