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    Some Algebra Problems...!!!

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    Problem #1.
    Telephoto lens. Please Use this formula:
    1/f = 1/o + 1/i

    Problem # 2.
    Upstream, downstream. Junior's boat will go 15 miles per
    hour in still water. If he can go 12 miles downstream in the
    same amount of time as it takes to go 9 miles upstream,
    then what is the speed of the current?

    Problem #3.
    Big plane. A six-passenger plane cruises at 180 mph in
    calm air. If the plane flies 7 miles with the wind in the
    same amount of time as it flies 5 miles against the wind,
    then what is the wind speed?

    Problem # 4.
    Filling a tank. A water tank has an inlet pipe and a drain
    pipe. A full tank can be emptied in 30 minutes if the drain
    is opened and an empty tank can be filled in 45 minutes
    with the inlet pipe opened. If both pipes are accidentally
    opened when the tank is full, then how long will it take to
    empty the tank?

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