exam Maths Puzzle Numerical Ability

How many sides does a regular polygon have if its interior angle measures 120 degrees?

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exam Other Question

PLease help me solve this equation.I am suck.
A line is located at (1,3) and (4,-2).Where is the slope.
I got -5/3
Thank YOu! 4. The Hudson River flows at a rate of 3 miles per hour. A patrol boat travels 60 miles upriver, and returns in a total time of 9 hours. What is the speed of the boat in still water?