Question

dede and mike both run the length of a two-mile field. if dede runs 5 mph and mike runs 6 mph, how many more minutes does it take dede to run the field

Answer 1

how long does it take to run 2 miles at 5 mph?

Answer 2

For me it takes about 10 minutes to run 2 miles

Answer 3

@satellite73: Have you seen that video on YouTube?

Answer 4

if it is not clear, use "distance is rate times time" or \(D=RT\) and so time is distance divided by rate, aka \(T=\frac{D}{R}\)

Answer 5

@FutureMathProfessor what is "that video"?

Answer 6

You know which one I'm talking about! That guy quizzing his girlfriend about speeds in a car :)

Answer 7

it would take me all morning to run two miles
no, i haven't seen it

Answer 8

http://www.youtube.com/watch?v=Qhm7-LEBznk

Answer 9

can u explain how to get the answer

Answer 10

what is t

Answer 11

2 miles at five mile per hour takes \(\frac{2}{5}\) of an hour

Answer 12

2 miles at 6 mpt takes \(\frac{2}{3}=\frac{1}{3}\) of an hour

Answer 13

i know that but how to get the answer

Answer 14

your job is to compute
\[\frac{1}{3}-\frac{2}{5}\]

Answer 15

that is how much longer it would take

Answer 16

you got this?

Answer 17

is it 5/15-6/15

Answer 18

actually that makes it more difficult, sorry
compute
\[\frac{2}{5}-\frac{1}{3}\]

Answer 19

is 1/15

Answer 20

got it
one fifteenth of an hour
now you have to convert to minutes: multiply by 60

Answer 21

4 minutes

Answer 22

yup

Answer 23

thx

Answer 24

yw

Answer 25

D1 = D2
R1T1 = R2T2
5T1 = 6T2
T1 = (6/5) T2 = (1 + 1/5)h = 1h + 1/5 * 60 m
so, it takes about 12 minutes

CMIIW

Answer 26

so who is right

Answer 27

Who do you think is right? Now that you know how to work it..........

Answer 28

I think @satellite73 explanation was very reasonable.
2/5 of an hour is 24 minutes
2/6 of an hour is 20 minutes
Whats the difference?

Answer 29

i dont get it

Answer 30

whatever

Answer 31

but thx for the help