Question 188567
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Take note: RC = 3HC, *High Speed is 3 times faster than Regular


1/RC + 1/HC = 1/Total Minutes, EQN 1
{{{(1/highlight(3HC))+(1/HC)=(1/12)}}}
Get LCD to add
{{{(1+3)/3HC=1/12}}}
{{{4/3HC =1/12}}} , cross multiply
{{{3HC*1=4*12=48}}} ----> {{{cross(3)HC/cross(3)=cross(48)16/cross(3)}}}
{{{highlight(HC=16minutes)}}}, High Speed Copier
Also,
{{{RC=3*HC=3*16=highlight(48minutes)}}}, Regular Copier

Check, go back EQN 1
{{{1/48+1/16=1/12}}}
{{{(1+3)/48=1/12}}}
{{{4/48=1/12}}}
{{{1/12=1/12}}}

Thank you,
Jojo</font>