The wait time doesn't matter since after their first meet, they both rest for 45 secs and then meet again.
Say, they meet again in 2 mins. But actually both swam for only 1 min 15 secs. Doesn't matter to us either way. Time for which they swam is still the same. So ratio of distance covered will still be the same as the ratio of their speeds.
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The wait time doesn't matter since after their first meet, they both rest for 45 secs and then meet again.
Say, they meet again in 2 mins. But actually both swam for only 1 min 15 secs. Doesn't matter to us either way. Time for which they swam is still the same. So ratio of distance covered will still be the same as the ratio of their speeds.[/quote]
Okay..I took example numbers for time and understood the same..but as this concept is completely new..it couldn't have struck in the test under pressure..is it honestly a GMAT problem?

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Just to highlight - For this equation to be formed, the underlying criteria that they both complete 1 Length of the pool (given in the question) is important.

I got confused with the fact that, Andy needn't have completed his 1 full length yet before meeting for the second time. I need to read the question prompt carefully.

I am stilling struggling to understand the question since I'm not english native speaker. Could anyone help explain the meaning of "deep end" and "shallow end" mentioned in the question? Without understanding correctly, I cannot depict the question....

A swimming pool is typically constructed in a rectangular fashion (L X B). It doesn't really matter what the deep and shallow ends actually are, other than the fact that they are opposite ends of a swimming pool.

Shallow end (4ft depth) Deep end (17ft)
_____________________________________________
|-------------------------------------------------------------|
|-------------------------------------------------------------|
|-------------------------------------------------------------|
|-------------------------------------------------------------|
|-------------------------------------------------------------|
<---------------Length of the pool---------------------->

The question indicates the race length as 2-length, which means the swimmer:

- goes from one end to and another
- and returns to that end to finish the race

Hope this helps.

Now I'm clear. Thank you very much.

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