<PRE><B>Question 779615</B>
The 1st two bells will ring at the same 
time every {{{ 6*7 = 42 }}} min
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The 3rd bell ring once every hour, or
once every {{{ 60 }}} min
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What is the smallest multiple of {{{ 42 }}}
that is evenly divided by {{{ 60 }}} ?
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{{{ ( 10*42 ) / 60 = 420/60 }}}
{{{ 420/60 = 7 }}}
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So, every {{{ 420 }}} min, all 3 bells ring together
{{{ 420 / 60 = 7 }}} hrs
12 noon + 7 hrs = 7 PM is when
they all ring together

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