Suatu regu pramuka membuat pionering gazebo. Satu pionering dikerjakan oleh 6 orang menghabiskan waktu selama 90 menit. Bila pionering tersebut dikerjakan oleh 9 orang, maka waktu yang dibutuhkan adalah ... jam. a. 60 c. 2 b. 75 d. 1

d. 1

The problem describes a situation where the time taken to complete a task varies inversely with the number of people working on it. This is an example of inverse proportion. In the given problem, 6 people take 90 minutes to complete the task. Therefore, the total person-minutes taken for the task is 6 people * 90 minutes = 540 person-minutes. When 9 people work on the same task, the time taken can be calculated by dividing the total person-minutes by the number of people. Time taken by 9 people = 540 person-minutes / 9 people = 60 minutes. Since 60 minutes is equal to 1 hour, the time required when 9 people work on the task is 1 hour.