Question 922809
{{{ 60 + 45 + 30 + 20 = 155 }}}
{{{ 155/60 = 2 + 35/60 }}}
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They need to start 2 hrs and 35 min before
the train leaves
{{{ 5 - 2 = 3 }}}
3 PM
and
{{{ 3 - 35/60 = 2 + 25/60 }}}
They should start the tour at 2:25 PM
check:
2:25 + 2 = 4:25
and
4:25 + 35 = 5:00 
OK