1.

A car travels 40 km at uniform speed of 40 km/h. What should be its speed for the next 80 km if the average speed for the entire journey is 60 kmperhour

Answer»

1st interval time=40 /40=1hrTotal distance =40+80=120kmTotal speed=60Total time=120/60=20hrSo,speed for 80km in 20hr=80/20=4km/hr is the right answer



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