book Maths Puzzle Numerical Ability

can some one please help me with this problem??

Solve the quadratic equation.

5t^2=240

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book Other Question

A biccycle wheel is 28 in. in diameter. How many revoltions will the wheel make in traveling one mile? Find the area of a parallelogram ABCD, given that AB = BE = ED = 1, and angle ABE = 90 degrees.