Question

An object travels a distance of 40km with avg speed of 80km/h and then next 40km with avg speed of 40km/h. Find the avg speed with the total distance.
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Answer 1

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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.

Answer 2

Answer:

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The total distance travelled is 80 km.

Half distance (40 km) is travelled at 80 km/h and the remaining half distance (40km) is travelled at 40 km/h.

Time used:

Formula : t=d/v

t=40/80=0.5 hour or 1/2 hour

t=40/40=1 hour

Total time taken = 1.5 hour

Now,

Speed = distance/time = 80/1.5 = 53.33 km/h

Answer : 53.33 km/h