Question

which is a better speed the one covering 240 km in 5 hours or the one covering 180 km in 4 hours.

Answer 1

by calculating the speed you can answer which is fast let us calculate
in first case s=d/t
s=240/5
s=48km/h
second case s=d/t
s=180/4
s=45km/hr
so now we can say first one is better in speed
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Answer 2

first of all we need to calculate the speed of both the cases.
speed = distance covered / time taken to cover that distance
in first case : distance covered = 240 km
time taken = 5 hrs
therefore speed = 240 / 5 = 48 km / hr
in second case
distance covered = 180 km
and time taken = 4 hrs
speed = 45 km/hr
you can see in first case speed is more than in the second case .