book Maths Puzzle Numerical Ability

A ski lift takes a skier up a slope at 50 meters/min.The skier then skis down the slope at 150meters/min. If one round trip takes 24 mins, how long is the slope?

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book Other Question

the line 2x+3y=1 intersects the curve x(x+y)=10 at A and B.Calculate the coordinates of A and of B. you have budgeted 450$ for carpeting. if you need 30 square yards of carpeting, how much can you spend per square yard?