2. Mrs. Walline travelled 60 km in 1 hour and then 2 more hours to travel 40 km on city

streets. What was her average speed?

Answer: 33.3 km/hr

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