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The surface of water in a water tank of ...

The surface of water in a water tank of cross section area `750 cm^2` on the top of a house is h m above the tap level. The speed of water coming out through the tap of cross section area `500 mm^2` is `30 cm//s`. At that instant, `(dh)/(dt)` is` x xx 10^(–3) m/s. ` value of `x` will be _______

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