To find the time (T), we can use the formula for speed:

Speed = Distance / Time

Given that the speed (S) is 17 m/s and the distance (U) is 171 m, we can plug the values into the formula:

17 m/s = 171 m / T

Now we can solve for T by rearranging the formula:

T = 171 m / 17 m/s
T = 10 seconds

Therefore, the time it takes to travel 171 meters at a constant speed of 17 m/s is 10 seconds.