mohon bantuannya no 14 dan 15

14. C
15. Maaf Belom bisa nanti nyusul

No 15
tA + tB = 4 jam
tA = 4 - tB

SA + SB = 260 km
vA(tA) + vB(tB) = 260 km
45(4-tB) + 75(tB) = 260
180 - 45tB + 75tB = 260
30tB = 260 - 180
30tB = 80
tB = 80/30
tB = 8/3 = 2 2/3 jam

sB = vB(tB)
sB = 75(8/3)
sB = 25(8)
sB = 200 km