Question

car travels first 80 km with the speed of 70 km/h and next 40 km with the speed of 140 km/h. find its average speed.​

Answer 1

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.

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Answer 2

Answer:

37.7777777

Explanation:

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