exam Maths Puzzle Numerical Ability

Jon leaves for chicago at 3:30. At 5:00 Karl leaves from the same place and heads for Chicago. If Jon averages 50 miles per hour and Karl averages 62 miles per hour, what time does Karl overtake Jon?

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Solve for y and answer

2/3(y+2) - 5/6(y-1) = 5/4(y-3) - 4
You have two stacks of coins. One stack is 15inches tall, the other is 9 inches tall. All the coins are the same thickness, what is the thickness of the coins?
(15/x)+(9/x)=24 ?