A car covered the first 400 m distance with a speed of 8 m/s, the next

1.	A car covered the first 400 m distance with a speed of 8 m/s, the next 1200 111 with a speed 12 m/s and the last 360 m with a speed of 12 m/s. Calculate the average speed of the car.
Answer» Average speed = \(\frac{Total\,distance\,travelled}{time\,taken\,to\,travel\,the\,distance}\) Time taken to travel the distance 400m = \(\frac{400}{8}\) = 50s Time taken to travel the distance 1200m = \(\frac{1200}{10}\) = 120s Time taken to travel the distance 360m = \(\frac{360}{12}\) = 30s Total distance travelled = 400 + 1200 + 360 = 1960m Total time to travel = 50 + 120 + 30 = 200s Average speed = \(\frac{1960}{200}\) = 9.8 m/s

A car covered the first 400 m distance with a speed of 8 m/s, the next 1200 111 with a speed 12 m/s and the last 360 m with a speed of 12 m/s. Calculate the average speed of the car.

Answer»

Average speed = \(\frac{Total\,distance\,travelled}{time\,taken\,to\,travel\,the\,distance}\)

Time taken to travel the distance 400m = \(\frac{400}{8}\) = 50s

Time taken to travel the distance 1200m = \(\frac{1200}{10}\) = 120s

Time taken to travel the distance 360m = \(\frac{360}{12}\) = 30s

Total distance travelled = 400 + 1200 + 360 = 1960m

Total time to travel = 50 + 120 + 30 = 200s

Average speed = \(\frac{1960}{200}\) = 9.8 m/s