Question 1078489
<pre>
                     RATE of BURN    TIME     CONSUMED     REMAINING

cheap candle         {{{1/3}}}               t       {{{t/3}}}                {{{1-t/3}}}

expensive candle     {{{1/5}}}               t       {{{t/5}}}                {{{1-t/5}}}
</pre>


After passage of {{{t}}} time,  the expensive candle was twice as long as the cheap candle.


{{{(1-t/5)/(1-t/3)=2}}}


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{{{t=2&1/7}}}-----time in hours
2 hours 9 minutes
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Observation done about 9:39PM.