book Maths Puzzle Numerical Ability

1) Find the measure of one central angle of a hexagon.
2) The measure of an angle is 20 more than the measure of its complement. Find the measure of the larger angle.

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(6a-5y)(7a+3y)

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Please help me with this problem:
Two cyclists start biking from a trail’s start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first