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21-02-2017
Physics

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A car travels a distance of 80 km. for the first 30 minutes it is driven at a constant speed of 80 km/hr. the motor begins to vibrate and the driver reduces the speed to 40 km/hr for the rest of the trip.the average speed for the entire trip is?

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XOXGRENADEXOX XOXGRENADEXOX

30-04-2017

80 + 40 = 120

30 + 60 = 1 hour and 30 minutes

120/90 = answer

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