A cheetah can run at approximately 100 km/hr and a gazelle at 80 km/hr. If both animals are running at full speed, with a gazelle 70 m ahead, how long before the cheetah catches its prey?

The cheetah's speed is 100x and The gazelle's speed is 80x + 70. Set the two equations equal to each other: 100x = 80x + 70 (then subtract 80x from both sides). 20x = 70 (then divide by 20). X = 3.5. The cheetah catches the gazelle after 3.5