Answer: 18
Explanation:
Given : A roller coaster takes 162 passengers around the track in 9 minutes.
To find : The number of passengers can the roller coaster take per minute.
The number of passengers the roller coaster takes in 9 minutes=162 passengers
i.e. The number of passengers the roller coaster takes in 1 minute =

Hence, the number of passengers the roller coaster takes in per minute = 18