book Maths Puzzle Numerical Ability

find the area, in cm2 of a triangle whose base is 18cm and whose height is 25cm?

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I need help with a homework problem i am having problems with.
The hypotenuse of a right triangle is 2.8 units long. The longer leg is 1.3 units longer than the shorter leg. Find the lengths of the sides of the triangle? 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?