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.

Question

anonymous · Answer

65

anonymous · Answer

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.

anonymous · Answer

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%?