The formula for finding time is the distance divided by the velocity.So the answer is 100÷30=3.3333...
Answer:
(-3+√17 )/2. or( -3-√17)/2
hope you got it
As shown in the figure below the answer is the last option:

The roots of the polynomial in the denominator are:


So, the inequality can be written as follows:

From this inequality we can study the signs and get the same conclusion just as shows the graph.
3x = 5(x-4)
I am not sure about the equal sign though.