Vint is testing ceiling fans in a factory. For one of the tests, he switches the fan on, and after it attains a maximum speed of 500 rotations per minute (rpm), he switches the fan back off, recording the amount of time it takes for the fan to completely stop spinning. The given equation models Vint's test, where x represents time in seconds and y represents the speed in rotations per minute.
The equation has been graphed as shown.
Assuming that the test was complete when the fan stopped spinning completely, how long was the test?
A.
10 seconds
B.
20 seconds
C.
100 seconds
D.
500 seconds