Question 1207612
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<pre>

They want you find the Less Common Multiple of numbers 36, 90 and 385 seconds, 
and then convert this numbers from seconds to  minutes.


    36 = 2^2*3^2;

    90 = 2*3^2*5;

    385 = 5*7*11.


To find LCM, we take the prime factor from each decomposition with the highest 
possible index.

Thus we get

    LCM(36, 90, 385) = 2^2*3^2*5*7*11 = 13860 seconds.


We convert it from seconds to minutes by dividing by 60.


Doing this way, we get the


<U>ANSWER</U>.  231 minutes.
</pre>

Solved, with complete explanations attached.



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The solution by @Theo is irrelevant, since he mistakenly used the value of 
345 seconds instead of the given value of 385 seconds.



Thus his answer is INCORRECT.