Question 813152
There is a certain number of 1/3 hr intervals that
add up to some other number of 5/4 hr intervals.
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Expressed as an equation:
{{{ a*(1/3) = b*(5/4) }}}
where {{{a}}} and {{{b}}} are whole numbers
{{{ a/b = (5/4) / (1/3) }}}
{{{ a/b = 15/4 }}}
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It looks like there are 15 local bus arrivals
and 4 express bus arrivals and the last ones
happen at the same time
{{{ 15*(1/3) = 5 }}}
and
{{{ 4*(5/4) = 5 }}}
So, in 5 hrs they depart at the same time