An oil tanker breaks apart and starts leaking.
Suppose that right after the shipwreck, the oil is
leaking out at a rate of 0.2 million gallons per minute,
and that the rate decays exponentially with a half-life
of 140 minutes.
Then, minutes after the shipwreck
the oil is leaking at a rate of million gallons per minute,
and
million gallons
of oil will leak out in the first 230 minutes after the shipwreck.