Question

if a truck covers 40 km with average speed of 80 km/h and then travels 40 km with average speed of 40 km/h. find the average speed of whole trip.

Answer 1

Answer:

Hello,

The general method of finding average speed (not velocity) is just divide total distance travelled by total time taken.

Mathematically,

Av. Speed = (total distance travelled÷total time taken)

Now coming to this question,

Time taken in first 40km=(40÷80) =1/2 hour

Time taken to travel next 40km=(40÷40) =1 hour

Now total time taken to travel 80km= 1/2+1 = 1.5hours,

According to formula mentioned above,

Av. Speed = 80/1.5 = 53.33km/h.

Hope that it is clear.

Answer 2

Explanation:

average speed= total distance travelled/total time taken