Can someone please help me on number 8

Rider A:  

EQUATION: Distance (km) = 60 km/h  Time (h)

In 15hs he will go 60x15 = 900km far

Rider B:  

EQUATION: Distance (km) = 24 km/h  Time (h)

In 15hs he will go 24x15 = 360km far

Step-by-step explanation:

Rider A:

Distance (km) = S Time (h)

One point is (time, distance) = (2hs, 60 km)

so:

60 = S 2  => S = 30 km/h

Rider B:

72/3 = 24

120/5 = 24

192/8 = 24

it means he rides at a constant speed of 24 km/h

the correct answer is the second option

by definition, an arc subtended by a central angle of some given measure has the same measure. so .