Reference answer: 440
Exam point: Travel problem - meeting and pursuit
87. A thief on a bus gets off when the bus arrives at a station and walks in the opposite direction of the bus's movement. After the bus continues, a passenger realizes they have been stolen from and gets off at the next station to chase the thief. If the passenger's speed is twice that of the thief, the bus's speed is ten times that of the thief, and the bus takes 40 seconds to travel between stations, then the passenger will catch up to the thief after $\qquad$ seconds of chasing.