What was the biggest decrease in time from the 1st leg to the 2nd leg? ?

The biggest decrease in time is 14.92 seconds.

Step-by-step explanation:

Consider the provided table.

Consider the row 1.

The biggest decrease in time from the 1st leg to the 2nd leg is:

55.3 seconds - 40.38 seconds = 14.92 seconds

Hence, the decrease in time is 14.92 seconds

Consider the row 2.

The biggest decrease in time from the 1st leg to the 2nd leg is:

55.29 seconds - 40.402 seconds = 14.888 seconds

Hence, the decrease in time is 14.888 seconds

Consider the row 3.

The biggest decrease in time from the 1st leg to the 2nd leg is:

55.295 seconds - 40.4 seconds = 14.895 seconds

Hence, the decrease in time is 14.895 seconds

Consider the row 4.

The biggest decrease in time from the 1st leg to the 2nd leg is:

55.037 seconds - 41.2 seconds = 13.837 seconds

Hence, the decrease in time is 13.837 seconds

From the above calculation it is clear that the biggest decrease in time is 14.92 seconds.