Help me with this math test pls

c=29*

Step-by-step explanation:

angle b is = 97*

a triangle adds up to 180*

so for this you would do

180-(97+54)

180-151

29*

c = 29

Step-by-step explanation:

B = 97 as it's vertically opposite

sum of angles = 180

97 + 54 = 151

180 - 151 = 29

Let $d$ be the length of one segment of the race.

Average speed is total distance divided by total time. The total distance is $3d$, and the total time is $\frac{d}{3}+\frac{d}{20}+\frac{d}{10}=\frac{29d}{60}$.

Thus, the average speed is $3d\div\left(\frac{29d}{60}\right)=\frac{180}{29}$. This is closest to $6$, so the answer is $\mathrm{(D)}$