One circuit of a model race car track measures 25 m. jack's car took 60 s to complete 5 laps. alice's car took 78 s to complete 6 laps. sarah's car took 44 s to complete 4 laps.

a) find what average speed of each car to the nearest tenth.
b) which car runs the fastest?

this is a percent word problem and i need to show all my work! i'm stuck on this problem and i need some ❤️

(25/60)*5=x
(25/78)*6=y
which is grater x or y

The equation that relate distance (D) time (T) and speed (S) is: D=ST 

Track 25M (one lap equals 25M)

A.
Jack 60s, 5laps; D=25x5 = 125M; T=60s ; S=D/T=125/60 =2.08M/s Speed=2.1M/s

Alice 78s, 6 laps; D=25x6 = 150M; T=78s; S=D/T=150/78=1.92 M/s
Speed 1.9 M/s

Sarah 44s, 4 laps; D=25x4 = 100M; T=44s; S=D/T=100/44=2.27 M/s
Speed 2.3 M/s

B.
Sarah's speed is more than the other drivers at 2.3 M/s

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct