We are told that a marathon is 26.2 miles long. There is a water station every 1 and 3/100 miles along the race route. We are supposed to write an expression that represents the total number of water stations.
Let x be total number of water stations.
First of all we will convert our mixed fraction into improper fraction.

The total number of water station in the marathon of 26.2 miles will be,

Therefore,
will represent the total number of water stations.