1.2 meters/second hope this helps!
I would think <span><span>6a/</span><span><span><span>27/5</span></span></span></span><span>=<span><span><span>10/9</span></span><span>a</span></span></span>
This is a 20% increase. If we divvy up the 25 into 5 groups, we can say that each group is 20%. since we added another group of 5, we can go off of our known values and say that this was a 20% increase.