A man walks on a straight road from his home to a moardet `3 km` away with a speed of`6 km//h`. Finding the market closed, he instantly turns and walks back with a speed of `9 km//h`. What is the (a) magnitude of average velocity and (b) averge speed of the man, over the interval of time (i) `0 to 30 min`, (ii) `0to 50 min`, (iii) `0 to 40 min`?

Options

A. `2.25kmh^-1,6.75kmh^-1`
B. `6.75kmh^-1,2.25kmh^-1`
C. zero `2.25kmh^-1`
D. zero `6.75kmh^-1`

Answer

A