goyalsau wrote:i spend more than 4 minutes in this question during the question and then realized that's it is too tough for me.
LOL...
At a speed of V, distance moved in a second is V, and for this to be not breaking rules
V ≥ D
Or V ≥ V^2/100 + 9
Or 100 V ≥ V^2 + 900
Or V^2 - 100 V + 900 ≤ 0
Or (V - 10) (V - 90) ≤ 0
If I were to find an answer to the presented question only, then I won't involve myself in tedious inequality solutions, choices suggest V is [spoiler]90, that's all.
It's B in your awkward choices[/spoiler]
