Wayne International Airport primarily serves domestic air

traffic. Occasionally, however, a chartered plane from abroad

will arrive with passengers bound for Wayne$$s two great

amusement parks, Algorithmland and Griffith$$s Cherry

Preserve.

Whenever an international plane arrives at the airport, the

two customs inspectors on duty set up operations to process

the passengers.

Incoming passengers must first have their passports and

visas checked. This is handled by one inspector. The time

required to check a passenger$$s passports and visas can be

described by the following probability distribution: