I have a physics midterm tomorrow and this is the only problem that I cannot figure out. Thanks for the help! The black mamba is one of the world's most poisonous snakes, and with a maximum speed of 18.0 km/h, it is also the fastest. Suppose a mamba waiting in a hide-out sees prey and begins slithering toward it with a velocity of +18.0 km/h. After 2.50 s, the mamba realizes that its prey can move faster than it can. The snake then turns around and slowly returns to its hide'out in 12.0 s. Calculate a. the mamba's average velocity during its return to the hide-out. b. the mamba's average velocity for the complete trip. c. the mamba's average speed for the complete trip.