Question

Train A leaves New York at 7:00am traveling to Boston at 80mph. Train B leaves Boston at 7:45am traveling to New York at 70mph on a parallel track. If the distance between New York and Boston along the tracks is 210 miles, at what time will the two trains pass each other?

Answer 1

HaHa We meet Again

Answer 2

I can do this on twiddla

Answer 3

PASS each other

Answer 4

I can do this here

Answer 5

Just a minute

Answer 6

I can too, but it's better on twiddla.

Answer 7

I can draw pictures

Answer 8

and charts

Answer 9

http://www.twiddla.com/588187

Answer 10

Your Question is Wrong

Answer 11

The Faster train starts at 7 and slower one at 7:45 How will they ever PASS

Answer 12

they are from two separate cities

Answer 13

going to one another

Answer 14

My Bad I should improve reading Sorry

Answer 15

I get 1.05 hrs

Answer 16

Okay So See my Creative Mind

0 210
||___________________________________|____________________________________________||
Boston x N.Y

Now we have it that they meet at x distance form Boston
Now we have two equations

\[\frac{210 - x}{70} = t + \frac{3}{4}\]
\[\frac{x}{80} = t\]

Answer 17

So, at just over 8:00, then will pass

Answer 18

How'd you end up with two variables?

Answer 19

I only needed one equation

Answer 20

Well it is 210-x for one train and x for other

Answer 21

but the difference in time is 3/4 hours

Answer 22

Actually, the exact time is 8:03

Answer 23

At 8:03, they will pass

Answer 24

GEEZ, they need to fix that...........

Answer 25

So x/80 is the time taken by faster one then 210-x is for the slower one
-----
70

Now because they have 3/4 hr difference

t = x/80

t - 3/4 = 210-x
-------
70

Answer 26

ah had a typo before it's - not + 3/4

Answer 27

I posted my solution on Twiddla...it took less than two minutes total time

Answer 28

Hero think about it in one hour the fast one shall travel 80 miles then 70 miles one should travel 70./4 how could they meet if 210 is the distance

Answer 29

i mean in 1 hour

Answer 30

I agree

Answer 31

One hour is too short

Answer 32

It should be around 1 hr and 40 minutes something like that

Answer 33

Yeah, I recalculated and got 1hr 36 minutes

Answer 34

So 8:36

Answer 35

using the same formula?

Answer 36

No, using a different one

Answer 37

what is the proper equation?

Answer 38

Wait, let me verify all of this..

Answer 39

i am getting 1.7 hours at x=140

Answer 40

and this should be quite right

1.75*80 = 140
and 70*1 =70

Answer 41

so we have 1.75 hours from 7:00

that makes 8:45 correct time

Answer 42

damn sure hafeez i am 100% correct

Answer 43

Hero it took us more then 2 minutes lol

Answer 44

Hey hit the good answer

Answer 45

Yeah, actually...I had the right equation, I just subtracted when I should have added

Answer 46

The equation I posted on Twiddla is right....

Answer 47

lolz it is mathematical error with human emotions

Answer 48

Just add 52.5 to 210 instead of subtract

Answer 49

Ishaan, I can't clarify a mistake?

Answer 50

I guess I'm not allowed to do that...

Answer 51

Okay Dokey :D

Answer 52

x = 1.75

Answer 53

time =1.75 yeah right where is hafeez he is not here

Answer 54

Of course not

Answer 55

http://www.twiddla.com/588187

Answer 56

I posted my solution here. You can see where I made my mistake

Answer 57

http://openstudy.com/study#/updates/500fde77e4b009397c67cf9c