A trucker drove 120 miles to make a delivery and returned home on the same route. Because of foggy conditions, his average speed on the return trip was 20 mph less than his average speed going. If the return trip took 3 hours longer, how fast did he drive in each direction?

Solved

Show answers

Ответ:

highflylex279

02.07.2020

Mathematics

Last option

Step-by-step explanation:

Since we can't factor out the quadratic, we need to use quadratic formula to solve this: $x = \frac{-b +/- \sqrt{b^2 - 4ac} }{2a}$

a = 5

b = -2

c = 6

$x = \frac{2 +/- \sqrt{(-2)^2 - 4(5)(6)} }{2(5)}$

$x = \frac{2 +/- \sqrt{4 - 120} }{10}$

$x = \frac{2 +/- \sqrt{-116} }{10}$

$x = \frac{2 +/- 2i\sqrt{29} }{10}$

$x = \frac{1 +/- i\sqrt{29} }{5}$

0,0(0 оценок)

Ask your question to the AI advisor

Ai-bot is an expert in any field and is the perfect companion for reliable and useful answers and advice on a variety of topics, including science, history, technology, art, sports, health, culture and more.

Ask your question

More tips

Answers on questions: Mathematics

Ask an AI advisor a question

I want advice