Question 856043
Rate*Time=Distance
{{{D[r]=40(t+3/60)}}}
{{{D[b]=60(t)}}}
Find {{{D[r]=D[b]}}}
{{{40(t+3/60)=60t}}}
{{{40t+2=60t}}}
{{{20t=2}}}
{{{t=2/20=1/10}}}
They are equal in 1/10 hour or 6 minutes.
{{{D=60(1/10)=6}}} {{{km}}}