Question 495919
You can think of this as 1 snail being fixed and the 
other moving at the sum of their speeds.
Let the speed of the moving snail = 
{{{ x + x - 2 }}} cm/min
given:
{{{ 432 = ( 2x - 2 )*27 }}}
{{{ 432 = 54x - 54 }}}
{{{ 54x = 432 + 54 }}}
{{{ 54x = 486 }}}
{{{ x = 9 }}}
and
{{{ x - 2 = 7 }}}
The snail's speeds are
9 cm/min
7 cm/min
------------
check answer:
Faster snail:
{{{ d[1] = 9*27 }}}
{{{ d[1] =  243 }}}
Slower snail:
{{{ d[2] = 7*27 }}}
{{{ d[2] = 189 }}}
and
{{{ d[1] + d[2] = 243 + 189 }}}
{{{ d[1] +d[2] = 432 }}} as it should be