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Mathematics 12 Online
OpenStudy (anonymous):

Solve this problem. Jeremy is making a 665 mile trip. He drives for 5 hours at 55 mph. What is the average rate of speed he must drive to complete the TOTAL trip in 11 hours? Assume that a steady speed is maintained for the rest of the trip.

OpenStudy (anonymous):

65

OpenStudy (anonymous):

He has already driven 5*55=275 miles. This means he has 665-275=390 miles to go. He has 6 hours left. Simply divide 390/6 to get your solution.

OpenStudy (anonymous):

John's average score on three tests is 87%. What is the least he can score on his fourth test so that his average grade will be at least 90%?

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