Question 244643
D=RT
24=(8+12)T
24=20T
T=24/20
T=6/5
T=1.2 HOURS THEY WILL MEET.
8*1.2=9.6 MILES FOR THE SISTER.
12*1.2=14.4 MILES FOR DAVID.
PROOF:
9.6+14.4=24
24=24