The question I'm stuck on is as follows: A cheetah sees an antelope and sneaks up on it until it is 35m away. It then charges after the terrified animal at 31 m/s. The antelope simultaneously flees away from the predator at a rate of 20 m/s. What distance does the cheetah have to covrer in order to catch the antelope? I'm at a complete loss here. If someone could show me how to figure this out, I'd be very greatful. I don't need the answer, just to be guided through the problem. Thanks in advance!