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(Its urgent please! I will give 20 points)A car driver completed the first 20 km of a 40 km trip at an average speed of 50 km/hr. At what average speed must the car driver complete the remaining 20 km to achieve an average speed of 60 km/hr for the 40 km trip? Find your answer in km/hr.​



Answer :

Answer:

Explanation:

Total distance  = 40 km

total distance / avg rate = time

   40 km / 60 km / hr =   2/3 hr     total time

First 20 km takes    20km / 50 km/hr =  2/5 hr

      2/3 hr - 2/5 hr = 4/15 hr to travel 20 km

                  20 km / (4/15 hr) = 75 km / hr required

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