When i see such questions, I first see which conversion is the question looking at.

Now, lets solve this question

Question speaks about minutes, So i will convert the seconds part into minutes

3x seconds to complete y yards

60 seconds(1 minute) will now take \(\frac{y}{3x}\)* 60 yards

Now we know the work done in a minute, we can now calculate, how much time will 10 z yards take

\(\frac{y}{3x}\)* 60 will be done in 1 minute

10 z will be done in \(\frac{3x}{(y*60)}\)*10Z

Solving that will give answer as

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If you notice any discrepancy in my reasoning, please let me know. Lets improve together.

Quote which i can relate to.

Many of life's failures happen with people who do not realize how close they were to success when they gave up.