Answer: 33.3 km/hr
Step-by-step explanation:
Given that,
distance travelled = 60 km
Time taken = 1 hour
Time taken on city streets = 2 hours
distance travelled on city streets = 40 km
Average speed = ?
Since average speed is total distance travelled per unit time, it is obtained by dividing the total distance travelled by the total time taken
i.e Average speed = (total distance / total time taken)
Total distance travelled by Mrs. Walline = (60km + 40km)
= 100km
Total time taken = 1 hour + 2 hours
= 3 hours
So, Av. Speed = 100km / 3hours
Av. Speed = 33.3 km/hr
Thus, Mrs. Walline's average speed was 33.3 km/hr