A man who is walking has a momentum of 80 kilogram meters per second west. The man has a mass of 80 kilograms. Which is the velocity of the man?

So, momentum is the product of mass times velocity. Some times, one just says mass times speed, but not in this problem. They ask for velocity, a vector.

vector momentum = mass * vector velocity,

So the velocity is 80/80 = 1 m/s west.