In 20 minutes, the trollies will return to the main building together. Therefore, 20 minutes is the correct answer.
How do determine the arrival time of the trollies?
In order to determine how many minutes will pass before the two trolleys arrive at the main building together, the following calculation must be done, looking for the least common multiple between the two numbers (4 and 10).
At the flower show, one trolley arrives every 4 minutes to transport visitors to the rose pavilion, and another trolley arrives every 10 minutes to transport visitors to the exotic flower greenhouse.
Trolley 1 takes a arrival time = 0 - 4 - 8 - 12 - 16 - 20
5 rounds for trolley 1 = 20 minutes
Trolley 2 takes a arrival time = 0 - 10 - 20
2 rounds for trolley 2 = 20 minutes
So long as 20 is the least frequent multiple of 4 and 10, the next time the trollies will reach the main structure simultaneously is in 20 minutes.
Check out the link below to learn more about arrival time;
https://brainly.com/question/24750145
#SPJ6
