book Maths Puzzle Numerical Ability

please help me with this problem:Expres .15(with the bar at the top of 15)as a fraction in simplest form.

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A skier rides a ski lift up a hill at 6km/hr. She skis back down parallel to the ski lift at 34km/hr. Round trip takes 30 minutes. How long far did she ski and for how long? an open topped box has a square base (bottom)and a height of 7cm. if the surface area of the five sides of the box is 165cm squared, find the dimensionsof the square base?