Well, you can use 1 number at a time until you can move to the next one. We start with:
Now, we know that:
1 m = 100 cm, so:
Now, we also know that:
60 s = 1 min, so:
So, what you have to do is divide that answer into the total distance:
So, I got a completely different answer than you... But I'm pretty sure I didn't do anything wrong.