Mathematics, 01.11.2019 21:31, bankskry

An automobile driver traveled the first part of a 400 mile trip at a average rate of 50 miles per hour. upon reaching an interstate route his average speed increased to 60 miles per hour his total travel time was 7 hours how far had he traveled when reached the interstate route

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An automobile driver traveled the first part of a 400 mile trip at a average rate of 50 miles per ho...