Rohan arrives 1 second too late, and waits 299 seconds.
Rohan arrives 2 seconds too late, and waits 298 seconds.
...
Rohan arrives 298 seconds too late, and waits 2 seconds.
Rohan arrives 299 seconds too late, and waits 1 second.
Rohan arrives 300 seconds too late, and waits 0 seconds.
Rohan arrives 301 seconds too late, and waits 0 seconds.
Rohan arrives 302 seconds too late, and waits 0 seconds.
...
Rohan arrives 539 seconds too late, and waits 0 seconds.
Rohan arrives 540 seconds too late, and waits 0 seconds.
So, add the 299 different delays (299, 298, ... , 1)
to the 241 non-delays, and divide by 540 seconds,
to compute an "average" wait-time.
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