Aperson walking covers 5 m ikn 10 s how fast is the person moving

Not what I'd call 'fast' at all.

Speed = (distance covered) / (time to cover the distance) .

Speed = (5 meters) / (10 seconds)

Speed = 0.5 meter per second .

That's like about 1.1 mile per hour .

Normal walking speed is considered to be around 1.4 m/s ... about 3.1 mph, or 14 meters in 10 seconds.

I've got a grandson who hasn't even turned 1 yet.  He crawls and  doesn't walk, but if you only cover 5m in 10s, he'd leave you in the dust pretty quick.

the answer is to check all of them! they all apply well at least i think so!

1/0.14nm = 10^10/1.4 a lot