Question 327600
Rate*Time=Distance
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Car 1:
1.{{{78*t=D}}}
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Car 2:
{{{72*(t+20/60)=D}}}
2.{{{72*(t+1/3)=D}}}
From eq.1,
{{{t=D/78}}}
Substitute into eq. 2,
{{{72*(D/78+1/3)=D}}}
{{{(12/13)D+24=D}}}
{{{D-(12/13)D=24}}}
{{{(1/13)D=24}}}
{{{D=312}}}km