Having a debate over and answer to a math questions and need to know whos right myself or friend

Question

here is the simple question, if you're traveling at 70 miles an hour how many minutes will it take to travel 5 miles? what is the correct answer and how did you get it?

Answer 1

It would take about 4 1/2 minutes

what you do is cross multiply 70/60 (which is 70 miles in 60 minutes) and 5/x (which is 5 miles in x minutes)

after you set that up you multiply 5 times 60 and divide it by 70 and after that you get 4.28 so i think that means 4 1/2 minutes...or 4 minutes and 16 seconds maybe...one of those

I hope that helped:)!!

Answer 2

70 miles in 1hr = 5miles in xhrs

cross multiply(70xX and 5x1)

5=70x

divide both sides by 70

5/70 = 0.07 hours

.07hrsx 60= 4.2 minutes

Answer 3

70 miles / 60 min. = 5 miles / x

If you cross-multiply, you get 70x = 300.  Divide both sides by 70 to get x on its own, so x = 300/70 = 4.29 minutes

So it would take 4.29 minutes (rounded to the nearest hundredth) to travel 5 miles.

Answer 4

You go 70 miles in 60 minutes, so your proportion is 70/60.  That same proportion will apply to the shorter distance, so you set 70/60 as equal to 5/x   You have the miles on top, the minutes on the bottom.  Then you can solve for x.  

70/60=7/6

7/6=5/x  so cross multiply, 7x=30, x=4 and 2/7 minutes, or about 4 minutes and 17 seconds.