In 2 hours the snowfall will be equal in both of the towns. You start off with 5 in T1 and 9 in T2 if T1 is growing by 5in every hour and T2 is growing by 3in every hour.
You take 5in then add it to anther 5in that makes 10in
You take 9in then add it to 3in and you get 12in
Do those steps until you have the same number for each town
