Question

Randy is driving 4 miles per hour faster than Sandy and if they are 287 miles apart
after 3.5 hours then how fast is Sandy driving?

Answer 1

287/4 should get you randys starting point

Answer 2

287/3.5

Answer 3

i set it up as
287=3.5S + 3.5R
R=S+4
(R being randys speed, S being sandys speed)

Answer 4

speed randy (time) + speed sandy (time) = 287

Answer 5

good good

Answer 6

and i got 39 for S
but thats not one of my options

Answer 7

idk what i did wrong

Answer 8

287 = (s+4)(3.5) + 3.5s

287 = 3.5s +3.5s + 14

287-14 = 7s

273 = 7s

273/7 = s

39 = s

Answer 9

maybe its a bad model :)

Answer 10

randy would be going 43 and sandy 39 right?

Answer 11

thats what i figured

Answer 12

maybe it changes if they are starting from the same spot

Answer 13

my options are
51
56
61
66
71

Answer 14

randy - Sally = 287

Answer 15

(3.5s + 14) - (3.5s) = 287 ?

Answer 16

its 39! :(

Answer 17

actually i got 0 when i did it again

Answer 18

lol try randy-287 = sally

Answer 19

nope

Answer 20

GAHHHH my teacher sucks

Answer 21

distance = speed (time) right?

Answer 22

yes
btw the last question you helped me with..the pools..i was looking at the wrong answer options..it wasnt 61

Answer 23

ohhhh...was that the one with 7.1 radius

Answer 24

yes
im just gonna yell at my teacher and tell him he gave me a faulty question

Answer 25

I get:

Dr = Ds + 287 but dunno if its gonna work :)

Answer 26

(s+4)(3.5) = s(3.5) + 287

Answer 27

got 0

Answer 28

if they start at different points and travel towards each other, but thats not in the question

Answer 29

right they are from the same point and driving away from each other

Answer 30

away from each other?

Answer 31

yeah

Answer 32

thenDr + Ds = 287 if thats the case

7s +14 = 287

7(s+2) = 287

i still get 39

Answer 33

:(

Answer 34

this class is ridiculous these are like impossible problems and i still have a whole other set of problems to start

Answer 35

if sally is not moving, does that change the dynamics of our problem?

Answer 36

yeah cuz then she would have no speed

Answer 37

and therefore would have no distance

Answer 38

think of it like this maybe....in one hour, randy if 4 miles farther.....

Answer 39

randy, at the end of 3.5 hours is 14 miles farther than sally

Answer 40

that wouldnt change the equation for sally's speed though..

Answer 41

they have traveled a distance of 273 miles if they were traveling the same speed right?

Answer 42

no because when we substitute R in for S+4 they arent

Answer 43

and the question says they are travleing different speeds

Answer 44

randy is 14 miles further than sally at 3.5 hours right?

Answer 45

yeah

Answer 46

so 287 - 14 = the distance traveled by Sally in 3.5 hours right?

273 in 3.5 hours?

Answer 47

speed equals distance/time

Answer 48

that gives me 78 mph..... but its closer :)

Answer 49

hahah and still not an option

Answer 50

I am giving up for tonight, thank you for all your help

Answer 51

:)

Answer 52

Gnite :)