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\noindent {\bf Problem statement} A flagpole is 40 feet high and
stands on level ground. A flag is attached to a 120 foot rope passing
through a pulley at the top of the flagpole. The other end of the rope
is tied to a car at ground level. If the car is driving directly away
from the flagpole at 3 ft/sec, how fast is the flag rising when the
top of the flag is 20 feet off the ground?

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