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David drove for 3 hours at a rate of 50 miles per hour.for 2 hours at 60 miles per hour and for 4 hours at a rate of 70 miles er hour.what was his constant-speed for the whole journey?
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David drove for 3 hours at a rate of 50 miles per hour.for 2 hours at 60 miles per hour and for 4 hours at a rate of 70 miles er hour.what was his constant-speed for the whole journey?

David drove for 3 hours at a rate of 50 miles per hour.for 2 hours at 60 miles per-example-1
User Csotelo
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61 miles per hour added total of miles and divided by hours
User MarkSouls
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