Here's the question you clicked on:
S
Rate question : Assume the rate remains at 1.82*10^-5 Ms^-1. How long would it take for [A] to change from 0.3585M to 0.3505M?
OK so the answer is 35783
rate is change in concentration per time \[Rate = \frac{\Delta [A]}{\Delta t}\]rearrange and solve for Dt (I get about 440s)