Answer:
14km/hr
Step-by-step explanation:
Speed = Distance/Time
If Scott runs 3 km in 30 minutes, his spped during this period is:
Time = 30min = 0.5hr
Speed = 3/0.5
Speed = 6km/hr
If he then runs 2 km in 15 minutes.
Time = 15mins = 0.25hr
His speed at this time = 2/0.25
Speed = 8km/hrr
Average speed = 6+8 = 14km/hr
Note that his speed is zero when he was at rest.
