Question

A teacher has to write a paragraph of 10 lines (end to end) on a writing board of size (2m x 2m) placed at the centre of the wall of the room with which a door is attached. If the classroom is cubical in shape with side length 7 m, and the teacher takes 30 minutes in completing the paragraph as well as entering and leaving the classroom, then the average speed of teacher is [Assume : Teacher enters and leaves the classroom from the same door at the corner of the wall and he directly starts writing the paragraph on the board and leaves the room immediately after completing the paragraph. Also assume teacher is constantly moving horizontally while writing the paragraph)​

Answer 1

Explanation:

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Answer 2

Answer:

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