Question 1084604
Question should be, "How long does it take train <b>B</b> to overtake train <b>A</b> ?"


Train A distance gone:  {{{45(t+1/5)}}}

Train B distance gone:  {{{54*t}}}

12 minutes is  {{{(1/5)hour}}}.


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{{{highlight(t=1)}}}----- 1 hour for B to catch-up with A.