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Mathematics, 09.07.2019 11:10 twirlergirl800

In the first half (distance) of a trip, a truck travels at a speed of 70 km/hr. how fast must it go during the second half of the trip to average 80 km/hr for the entire trip? km/hr

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In the first half (distance) of a trip, a truck travels at a speed of 70 km/hr. how fast must it go...
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