GMAT Prep

Given D = 2 Hence circumferenec wil be pi * d = 6.28 approx

Time taken will be 6.28/3 = a number bwtween 2 and 2.5

Hence C

Hope this helps

Obviously agree with sujaysolanki! But sujaysolanki, I would like to mention something - [May be this is a very minor thing to follow!]
As you referred -

Given D = 2 Hence circumferenec wil be pi * d = 6.28 approx

Here I will say that the circumference = 2* 22 * 1/7 [--> 1 = radius]
= 44/7
So time = 44/(7 * 3) = 44/21
As we know 21 * 2 = 42 so the best option to chose is C. - What I wanted to say that there is no need to calculate all the fields. Because these calculations are very time-consuming and can lead u to some mistakes also! To me, its better to use some approximation (when there is an option to do that) rather than calculation. Am I clear to explain my idea?

Yes completely agree ..less calculation will save time ..