Question

A car travels the first 19 km of its journey at an average speed of 57 km/h and the remaining 55 km at an average speed of 110 km/h. Find the average speed of the car for its entire journey.​

Answer 1

Answer:

Answer:

Speed(s)=distance(d)/time(t)

Let us assume the total distance travelled to be 3x.

So the car travels x distance with each speed.

Since, s=d/t,

t=d/s

So the total time taken would be

T=x/40 + x/50 + x/60

Total distance, D=3x

Avg speed = D/T = 3x/( x/40 + x/50 + x/60 )

Cancel x from numerator and denominator and solve for average speed.

Step-by-step explanation:

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