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It cannot be done. The trip is 60km. The half-way point is at 30 km. At 30km/hr, it takes 1 hour to go half-way. To average 60 km/hr, you would need to make the entire trip in 1 hour. So you have already consumed all your time.

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Q: If you go halfway to the town which is 60 km away at the speed of 30 kmhour how fast do you have to go for the rest of the way to have the average speed of the entire way 60 kmhour?
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