Water is flowing at the rate of 18km/h through a pipe of diameter 7cm into a cuboidal tank which is 100m long and 22n wide. In what time will the level of tank rise by 42cm
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take our ur ncertbook in that open surface and volume chapter than open CBSE guide there you will get the answer my dear....usma jyada accha said smajh maia ayaga....hope u understand...
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