Question 357148
D=RT
690=65T+50(11.4-T)
690=65T+570-50T
65T-50T=690-570
15T=120
T=120/15
T=8 HOURS FOR THE 65 MPH TRIP.
11.4-8=3.4 HOURS FOR THE 50 MPH TRIP.
PROOF:
690=65*8+50*3.4
690=520+270
690=690