To compare decimals you start with the numbers on the left. If the digits are equal, move to the next number on the right. Rex's number is bigger (3) which means he took more time running. Spot is the winner!
But they both got 28 mins. and 32 seconds!
Yes! It's a tie!
What? No- Spot won!
No... The thousands spot shows that Spot had 1/1000th and Rex had 3/1000th of a second. Spot is the winner.