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-   -   How to solve apart problems? (http://mymathforum.com/elementary-math/344533-how-solve-apart-problems.html)

Ganesh Ujwal July 9th, 2018 05:53 AM

How to solve apart problems?
 
A and B leave their places and start moving towards each other. If they are 50m apart after both 2 minutes and 3 minutes, how far apart are their places?

I draw the diagram of this problem:

https://i.imgur.com/2yacgZf.jpg

After this. how to proceed from here?

MarkFL July 9th, 2018 07:12 AM

I would write:

$\displaystyle d-50=2v$

$\displaystyle d+50=3v$

Can you proceed?

skipjack July 9th, 2018 08:26 AM

Further information is needed, else it needs to be assumed that $v$ is a constant.

Ganesh Ujwal July 9th, 2018 09:11 AM

Quote:

Originally Posted by MarkFL (Post 596382)
I would write:

$\displaystyle d-50=2v$

$\displaystyle d+50=3v$

Can you proceed?

why d - 50 = 2v ? why not d +50 = 2v?

MarkFL July 9th, 2018 09:17 AM

After 2 minutes, the combined distance covered by the two moving objects is 50 m less than their initial distance apart (which I've labeled d).

Ganesh Ujwal July 9th, 2018 08:44 PM

Quote:

Originally Posted by MarkFL (Post 596391)
After 2 minutes, the combined distance covered by the two moving objects is 50 m less than their initial distance apart (which I've labeled d).

What combined distance covered by the two moving objects are you referring?

Are you referring to this:

https://i.imgur.com/3MbCxu1.jpg

combined distance = AC + DB?

MarkFL July 9th, 2018 08:49 PM

Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.

Ganesh Ujwal July 10th, 2018 06:11 AM

Quote:

Originally Posted by MarkFL (Post 596425)
Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.

What about 3 minutes?

skipjack July 10th, 2018 06:33 AM

1 Attachment(s)
Attachment 9802
Not the best diagram above, but you can get the idea.

AC + DB is now AB + 50 m (where AB = d).

Ganesh Ujwal July 10th, 2018 06:51 AM

Quote:

Originally Posted by skipjack (Post 596451)
Attachment 9802
Not the best diagram above, but you can get the idea.

AC + DB is now AB + 50 m (where AB = d).

How did you draw the diagram? It was awesome.

I didn't get the idea, but I understand the diagram.


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