Which among average speed and average velocity can be positive, negative or zero ?

A cyclist starts from the centre $O$ of a circular park of radius one kilometre, reaches the edge $P$ of the partk. Then cycles along the circumference and returns to the centre along $QO$ as shown in the figure. If the round trip takes ten minutes, the net displacement and average speed of the cyclist (in metre and kilometre per hour respectively) is

If a car covers $2/5^{th}$ of the total distance with $v_1$ speed and $3/5^{th}$ distance with $v_2 $ then average speed is

If magnitude of average speed and average velocity over a time interval are same, then

A particle travels half of the distance of a straight journey with a speed $6 \,m / s$. The remaining part of the distance is covered with speed $2 \,m / s$ for half of the time of remaining journey and with speed $4 \,m / s$ for the other half of time. The average speed of the particle is ....... $m / s$

One car moving on a straight road covers one third of the distance with $20 \,km/hr $ and the rest with $60\, km/hr$. The average speed is..........$km/hr$