Question

There is a 6-storey building with 20 room on each floor. Some toxic material is concealed in the building. Three groups of officers start the search operation simultaneously. The first group searches the 1st and 2nd floors. The second group handles the 3rd and 4th floors. The third group takes over the 5th and 6th floors. If it takes 1 minute to reach any nearest floor and 1 minute to search each room, how much time will be taken to complete the entire search operation?

• A. 126 min
• B. 46 min
• C. 40min
• D. 61 min

Answer 1

Answer: (B)