exam Maths Puzzle Numerical Ability

Noah and Ben are running in the Walker Street Fun Run. Noah runs at 7mph, Ben at 5mph. If they start at the same time, how long will it be before they are 1/3 mile apart?

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exam Other Question
The average of 2 numbers is 15 and four times the difference between them is 4o. Find the numbers. Solve for x algebraically: 5^(2x)- 4(5)^x=-3