Answer:
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
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