Question 601293
{{{ a + 15 = 60 + b }}}
{{{ a = 6b }}}
----------
{{{ 6b + 15 = 60 + b }}}
{{{ 5b = 45 }}}
{{{ b = 9 }}}
The 2nd time, it was 9 minutes after 3
check:
{{{ a = 6b }}}
{{{ a = 54 }}}
The 1st time it was 2:54
15 min later would be
3:09
OK