Question

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Answer 1

Answer:

Q3: p^2x^2+(p^2-q^2)-q^2=0

p^2x^2+p^2x-q^2x-q^2=0

p^2x(x+1)-q^2(x+1)=0

(p^2x-q^2)(x+1)=0

x+1=0, x=-1

p^2x-q^2=0

x=q^2/p^2

Q:9

{(12/(11+s)}+{12/(11-s)}=2hr 45 mt =11/4 hr

12{1/(11+s)+1/(11-s)}=11/4

12×22/(121-s^2)=11/4

12×2×4=121-s^2

s^2=121-96=25

s=5=speed of stream water