two speedboats leave the dock at the same time and travel in opposite directions. one travels 9 mi/hr faster than the other. Aft

Question

3 years ago

12

er 2 hr the boats are 170 mi apart. How fast is each boat travelling ?

1 answer:

Likurg_2 [28] · Answer 1 · 2023-02-08T12:55:55+03:00

6 0

Answer: $\frac{170}{X}$ + $\frac{170}{X-9}$ =2

(=)17 0x +170x+1530=2x²+18x

(=)-2 x² +322x+1530=0

Δ=b²-4ac

Δ=115924

$\sqrt{}$ Δ=340,476>0

because Δ>0 so that 2 X

=>x₁=2 (true), x₂=-161(false)

X+9= 2+9=11

first travel 2 mi/hr

second travel 11 mi/hr

Step-by-step explanation: