Next time to car carryin A return to same point (50t-10t)/60*2 = 4t/3
.
in tht tym B travls= 40t/3
.
1220-50t)/50 = 1200-50t -40t)/3)/10
.
t= 18hrs left dis= 1200-50*18 = 300
.
total tyn t +4t/3 +300/50 = 48hrs

shortcut
.
Car will travel double the distance
.
2400/50 = 48hrs ✓

Best approach

100-(50 +11.5) = 38.5
100-(50+18) = 32
.
100 = 160
.
38.5 +32*1.3 = 12816

X+1/x= √3-1/√2
X²+1/x²= 4-2√3-4/2= -√3
X⁶+1/x⁶= 0
X¹² = -1

X¹²)¹⁷⁴ *x+1/x¹²)¹⁷⁴*x=
X+1/x= 2sin15= 2cos15*cot75

1,x,x²
P & Q
25, 49

R & S
9. 4

25-49-1/5= -5

-s-1