Question 322177
Rate*Time=Distance
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1.{{{Ra=Rb-10}}}
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{{{Ra*T=210}}}
2.{{{Ra=210/T}}}
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{{{Rb*T=260}}}
3.{{{Rb=260/T}}}
Substitute eq. 2 and eq. 3 into eq. 1,
{{{210/T=260/T-10}}}
{{{210=260-10T}}}
{{{10T=50}}}
{{{T=5}}} hr
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{{{Ra=210/5=42}}} mph
{{{Rb=260/5=52}}} mph