exam Maths Puzzle Numerical Ability

A plane flies 300 miles with a tail wind in 1 hour. It takes the same plane 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air?

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exam Other Question

The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions(the length and width) of the rectangle?

x + (x+1)= 4

Am I on the right track in solving this problem? At Jones Realty each sale of a house results in 6% of the selling price being paid to the business. The selling agent then receives 60% of that amount as commission. If an agent sells a house for $225,000, what is the commission on the sale?