exam Maths Puzzle Numerical Ability

Karen left her house heading east and her sister left two hours later heading west at a rate 5 mph faster than Karen. 6 hours after Karen left she and her sister were 600 miles apart. How fast was Karen moving?

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exam Other Question
ANNA HAS 12 BILLS IN HER WALLET, SOME $5 AND SOME $10 THE TOTAL VALUE OF THE BILLS IS $100. HOW MANY OF EACH BILL DOES ANNA HAVE?
 Subtract. Simplify by removing a factor of 1 when possible.

5fc/f^2-c^2 - f-c/f+c