exam Maths Puzzle Numerical Ability

A table is three times as long as it is wide. If it were 3 ft shorter and 3 ft wider, it would be square (with all sides equal). How long and how wide is the table?

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Can I have some help finding the inverse function of f?

f(x)=1/(-10 x^2 + 6),text( )x>=0 Karin biked at 13 mph for a time but got a flat tire. She then walked at 5 mph. She traveled a total of 93 miles. Had she biked the whole time, she would have gone 117 miles. How many hours did she walk?