Multiple choice general knowledge sports

Byomkesh Bakshi has been investigating burglary at a bank. Bank Manager says I locked the vault door at 9 o’clock midnight and everything was ok. I ask the guard to be alert and left. The guard says he has been monitoring the vault through camera every half hour. The vault has just one camera. If floor of vault is 100m*10m and height of the wall is 3 meter. The camera is at the ceiling in one corner. Find the volume in which the thief can hide, if the camera can project only 70% of the volume of the room.

  1. 90 cubic meter

  2. 900 cubic meter

  3. 210 cubic meter

  4. 21 cubic meter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total room volume = 100m × 10m × 3m = 3000 cubic meters. The camera covers 70% of volume, so hidden volume = 30% of 3000 = 900 cubic meters. The thief can hide in the 30% blind spot area not covered by the camera surveillance.

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