exam Maths Puzzle Numerical Ability

My mind has gone blank....any help is greatly appreciated:

A boat has a speed of 5 mph in still water. The boat can travel 21 miles with the current in the same time in which it can travel 9 miles against the current. Find the rate of the current.

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exam Other Question

Four years ago, the average age of A and B was 18 years. At present the average age of A, Ba nd C is
24 years. What would be the age of C after 8 years? A rectanular plot has been fenced with 500ft of wire. find the length and width of th plot if the length is 4 more than twice the width. Be sure to show both length and width along with units in your answer.

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