how long before the cheetah gets its prey

Question

A cheetah can run at a maximum speed 103 km/h and a gazelle can run at a maximum speed of 76 km/h. If both animals are running at full speed, with the gazelle 84.1 m ahead, how long before the cheetah catches its prey

Answer 1

The additional speed the cheetah has is 103 km/h - 76 km/h = 27 km/h = 27000 m/h.

So, how long does it take for an object to travel 84.1m that is going 27 km/h?

time = 84.1 m / 27000 m/h = 0.003 h = 11.2 seconds