Question 249444
D=RT
D=45T THE TRIP TO HER SISTER'S HOME.
D=55(4-T-1.5) THE RETURN TRIP
45T=55(2.5-T)
45T=137.5-55T
45T+55T=137.5
100T=137.5
T=137.5/100
T=1.375 HOURS FOR THE TO TO HER SISTER'S HOUSE.
4-1.5-1.375=1.125HOURS FOR THE RETURN TRIP.
PROOF:
45*1.375=55(4-1.375-1.5)
61.875=55*1.125
61.875=61.875