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**mode** A car is going 56km/h, it is accelerating at a rate of $\displaystyle {6m/s^2}$. How long would it take for it to obtain a speed of 90km/h?

For some reason i have some sort of brain block when it comes to conversion factors. Here is my attempt at an answer.

56km/h X $\displaystyle \frac{1000m}{1km}$ X $\displaystyle \frac{1hr}{3600s}$=15.56m/s

90km/h X $\displaystyle \frac{1000m}{1km}$ X $\displaystyle \frac{1hr}{3600s}$= 25m/s

25m/s-15.56m/s= 9.44m/s

9.44/6m/s=1.57s

answer=1.57s?