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 July 9th, 2018, 04:53 AM #1 Senior Member   Joined: Aug 2014 From: India Posts: 458 Thanks: 1 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: After this. how to proceed from here?
 July 9th, 2018, 06:12 AM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs I would write: $\displaystyle d-50=2v$ $\displaystyle d+50=3v$ Can you proceed? Thanks from topsquark
 July 9th, 2018, 07:26 AM #3 Global Moderator   Joined: Dec 2006 Posts: 20,926 Thanks: 2205 Further information is needed, else it needs to be assumed that $v$ is a constant. Thanks from topsquark
July 9th, 2018, 08:11 AM   #4
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 Originally Posted by MarkFL I would write: $\displaystyle d-50=2v$ $\displaystyle d+50=3v$ Can you proceed?
why d - 50 = 2v ? why not d +50 = 2v?

 July 9th, 2018, 08:17 AM #5 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs 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).
July 9th, 2018, 07:44 PM   #6
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Quote:
 Originally Posted by MarkFL 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:

combined distance = AC + DB?

 July 9th, 2018, 07:49 PM #7 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.
July 10th, 2018, 05:11 AM   #8
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Quote:
 Originally Posted by MarkFL Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.

 July 10th, 2018, 05:33 AM #9 Global Moderator   Joined: Dec 2006 Posts: 20,926 Thanks: 2205 Apart.PNG Not the best diagram above, but you can get the idea. AC + DB is now AB + 50 m (where AB = d). Last edited by skipjack; July 10th, 2018 at 11:43 AM.
July 10th, 2018, 05:51 AM   #10
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Quote:
 Originally Posted by skipjack 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.

Last edited by skipjack; July 10th, 2018 at 11:47 AM.

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