1.

a car covers (3/5) th distance at the speed of 72 km /h an the rest of distance with 54 km/h the average speed of the car for complete journey is​

Answer»

n :Let the total distance covered by the car be d From point A to B SPEED (s)= 72 km /HR = 72 x 5 / 18 = 20 m/sDistance(d) = 3d / 5 We know that ,➝ s = d / tOn rearranging ,➝ t = d / s ➝ t = 3d / 5 x 20➝ t = 3d / 100 From point B to C Speed (s)= 54 km /hr = 54 x 5 / 18 = 15 m/sDistance(d) = d- 3d / 5 = 2D / 5 We know that ,➝ s = d / tOn rearranging ,➝ t = d / s ➝ t = 2d / 5 x 15➝ t = 2d / 75The average speed of the car is 17.64 m /s



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