It took 25 minutes for the first 37 people pass through at the airport. If it takes the same amount of time for each person, how long will it take for the whole plane of 111 people to pass through customs?

Answer

74.99 minutes.

Q: How many people passed through customs in 1 minute? A:37/25 = 1.48
Q: How long will it take for the whole plane of 111 people to pass through customs? A:111/1.48 = 74.99 minutes.