Answer :
Answer:
4 seconds.
Step-by-step explanation:
Let t be the time in seconds when the cheetah catches the antelope.
-Cheetah's speed is 90ft/s and the antelope's is 60ft/s with a 120ft distance between them.
#The expression of the distance of the two when they catch up is;
[tex]Cheetah:90t\\\\\\Antelope:60t+120[/tex]
#Since the distance of the two will be equal at that point:
[tex]90t=60t+120\\\\30t=120\\\\t=4[/tex]
Hence, the Cheetah catches the antelope after 4 seconds.