Question 335548
Rate*Time=Distance
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.
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1.{{{45*T1=D}}}
2.{{{60*T2=D}}}
3.{{{T1+T2=70}}}
From eq.1,
{{{T1=D/45}}}
From eq. 2,
{{{T2=D/60}}}
Substitute into eq. 3,
{{{D/45+D/60=70}}}
Multiply both sides by {{{45*60}}}
{{{60D+45D=189000}}}
{{{105D=189000}}}
{{{highlight(D=1800)}}} miles