Question 329450
Rate*Time=Distance
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When the car starts, the train is 30 km (1 hr) ahead.
{{{Dt=30+30t}}}
{{{Dc=Rc*t}}}
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When {{{Dt=Dc}}}, then {{{t=3}}}. 
{{{Dt=Dc}}}
{{{30+30t=Rc*t}}}
{{{30+30(3)=Rc*(3)}}}
{{{Rc=10+30}}}
{{{Rc=40}}}kph