Question 335095
Rate*Time=Distance
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{{{60*T1=D1}}}
{{{100*T2=D2}}}
1.{{{D1+D2=1080}}}
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{{{T1+T2=12}}}
{{{D1/60+D2/100=12}}}
2.{{{5D1+3D2=3600}}}
From eq. 1,
{{{D1=1080-D2}}}
Substitute into eq. 2,
{{{5(1080-D2)+3D2=360}}}
{{{5400-5D2+3D2=3600}}}
{{{-2D2=-1800}}}
{{{highlight(D2=900)}}}km
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{{{D1+900=1080}}}
{{{highlight(D1=180)}}}km