Question 860945
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Hi,
Let x represent time together
Use fill per min as equalizer: 
 {{{1/5 + 1/10 = 1/x }}}     |Multiplying thru by 10x so as all denominators = 1 
 2x + x = 10
    3x = 10min
     x = 10/3   0r    3  <sup>1</sup>&frasl;<sub>3</sub> min