DIRECTIONS for the question: Solve the following question and mark the best possible option.
What is the approximate difference in time taken when a person moves around a square field of side 100 m and time taken when it covers one diagonal of the same square field with a speed of 10m/s?
A)
10 sec
B)
15 sec
C)
20 sec
D)
None of these
D
Total distance to cover the four sides of the square = 4 ×100m = 400 m
Time taken = 400/10 = 40s
Diagonal length = 100√2m
Thus, time taken to cover diagonal length = 100√2/10 = 10√2 ≈ 14s
