The magnitude of average velocity is equal to average speed.In which case this condition is staisfied?

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h^(-1) . Finding the market closed, he instantly turns and walks back home with a speed of 7.5km h^(-1) . a) What is the magnitude of average velocity, and b) average speed of the man over the following intervals of time: i) 0 to 30 min, ii) 0 to 50 min, iii) 0 to 40 min ?

Read each statement below carefully and state with reasons,if it is true or false: a)the magnitude of a vector is always a scalar. b)Each component of a vector is always a scalar. c)The total path length is always equal to the magnitude of the displacement vector of a particle. d)the average speed of a particle (defined as total path length divided by the time taken to cover the path) is either greater or equal to the magnitude of average velocity of the particle over the same interval of time. e)three vectors not lying in a plane can never add up to give a null vector.

State True or False - “The average speed and average velocity of a particle are equal if it travels in a straight line without changing its direction of motion”

What conclusion can you draw if the average velocity is equal to instanteneous velocity?