A car covers half the distance at a speed of 60 kmh and other 40kmh find average car?

Speed of the car for the first half distance = 60 km/h

Speed of the car for the second half distance = 40 km/h

Total Distance covered = 2s = 2d

To Find:

Average speed of the car

Formula:

Average Speed = Total distance/ total time taken

= 2s / ( t₁ + t₂)

Calculation:

First we have to find the time taken to cover each distance.

Time taken to cover the first half distance (t₁ )

= Distance/ Speed

= s / 60

Time taken to cover the second half distance (t₂)

= Distance / Speed

= s/ 40

Now, the average speed of the car is

Average Speed = 2s / (t₁ + t₂)

=> Average Speed = 2s/ ( s / 60 + s / 40)

Taking S common from the numerator and denominator

= 2s / s (1/60 + 1/40)

= 2s / s (7/120)

= 2 / (7/120)

= 2 * ( 120 / 7)

= 2 * ( 120 / 7)

= 240 / 7

Therefore the average speed of the car is 240/7 km/h.