Simple Physics help?

Question

If speed=distance/time why can't I get a correct answer when I do

v=20 miles / 15 minutes

I used a calculator on the internet and they said the answer was 80 mph, can someone give me step by step instructions on how to do this, thanks

Answer 1

15 minutes is 1/4 hour

20 / 1/4 = 20*4 = 80 mph

.

Answer 2

Sounds like you may be confusing your minutes and hours. If you want to find the speed in mph, you would have to phrase your equation in those terms.

15 minutes = 0.25 hours (quarter of an hour)

20 / 0.25 = 80mph

Answer 3

you must change the things you have!

v=20miles/15minutes

v=20miles/0.25hour

v=80miles/hour

so it's not 80 mph, ok?! you haven't changed mile to meter! so do it right now!!!