Distance 8080

The driver covered the distance between the two cities in 2 hours at an average speed of 75 km/h. How does he have to change speed to get 20 minutes faster?

Correct answer:

v2 =  90 km/h
d =  15 km/h

Step-by-step explanation:

v1=75 km/h t=2 h  s=v1 t=75 2=150 km t2=t6020=26020=602 606020=601206020=6012020=60100=351.6667 h  v2=s/t2=150/35=150:35=150 53=5150 3=5450=90 km/h
d=v2v1=9075=15 km/h

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