[mce86]

You have 9 spades. Plus 3 non spade tens and 3 non spade 5's. Add your 3 aces and you have 18 outs.
There are 52 cards in the deck, minus the 3 on the flop gives you 49. Minus the 2 in your hand gives you 47. Take away the 18 outs you have (vs. 1 pair) and you have 29. That means 29 cards come and your opponent wins to your 18 cards that beat you. Odds are approximately 29-18 or (divide both of those by 9) 3 to 2. 1.5 to 1, or a slight fav. to the river vs. 1 pair.