exam Maths Puzzle Numerical Ability

Line AC is perpendicular to line BC, Line CD is perpendicular to line AB, line DE is perpendicular to line AC, line DG is perpendicular to line BC, line DF is perpendicular to line

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exam Other Question
Sharon and Ken drove to the service station at 60 km per hour. They returned home by bicycle at 15 km per hour. The entire trip took 4 hours. How far was the round trip? tan^2x-cot^2x=sec^2x-csc^2x