a car travels the first 30 km with a uniform speed of 60km per hour and the next with a uniform speed of 40km h-1 . Calculate the total time of journey and the average speed of the car
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Answer:
- formula of average speed is =
- initial speed + final speed divide by 2
- so means
- 60 + 40 divide by 2 = 50
- so the average speed is 50 km/hr
- And the total time is 75 minutes
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