Question

A cheetah can run at top speed for only about 20 seconds. If an antelope is too far away for a cheetah to catch it in 20 seconds, the antelope is probably safe. Your friend claims an antelope running 60 feet per second will not be safe if the cheetah running at 90 feet per second is 650 feet behind it. Is your friend correct?

Answer 1

In 20 seconds, the antelope will cover 60 x 20 = 1,200 feet
In 20 seconds, the cheetah will cover 90 x 20 = 1,800 feet

Distance between the antelope and the cheetah after 20 seconds = 650 - 600 = 50 feet

The antelope will be safe.