book Maths Puzzle Numerical Ability

8. Kiran drove from Tortula to Cactus, a distance of 250 miles. She increased her speed by 10 miles per hour for the 360-mile trip from Cactus to Dry Junction. If the total trip to

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The revenue (in millions of dollars) from the sale of x units at a home supply outlet is given by r=.21x. The profit (in millions of dollars) from the sale of x units is given by p The sum of 2 numbers is 25. The sum of their squares is 313. Find the two numbers...thank you!