Question 725941
From the time that the front is just entering the tunnel,
the back of the train has to travel {{{ 1/8 + 1 = 9/8 }}} mi
{{{ 9/8 = 45*t }}}
{{{ t = (9/8) / 45 }}}
{{{ t = .025 }}} hrs
{{{ .025*60 = 1.5 }}} minutes