A car travels the first half of a journey at a speed of 80 km/h and the next half of the journey at 100 km/h. What is the average speed of the car? [Give your answer correct to 2 places of decimal.]

92.29 km/h 88.89 km/h 82.28 km/h 45.41 km/h

88.89 km/h

Average speed = \(\frac{ 2 × S1 × S2  }{S1 + S2 }\) = \(\frac{ 2 × 80 ×100  }{80 + 100 }\) = \(\frac{ 16000  }{180 }\) = 88 .89 km/h   ( approx)