we know that
if small snail moves 1/50 miles in ---------------> 5/6 of an hour
then
X miles in-------------------------------------> 1 hour
X=(1/50)/(5/6)------> 6/(50*5)------> x=0.024 miles
0.024------> 24/1000-------> 12/500-----> 6/250-----> 3/125 miles
the answer is
3/125 miles (0.024 miles)