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? 
I would write: $\displaystyle d50=2v$ $\displaystyle d+50=3v$ Can you proceed? 
Further information is needed, else it needs to be assumed that $v$ is a constant. 
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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). 
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Are you referring to this: https://i.imgur.com/3MbCxu1.jpg combined distance = AC + DB? 
Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them. 
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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). 
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I didn't get the idea, but I understand the diagram. 
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