एक घंटे में कितना कार्य होता है.यदि
एक पम्प एक मिनट में 200 मीटर उँचाई तक 100 लीटर पानी उठा सकता है?
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If you write in english may be i can help you
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How much work done in one hour,if a pump can raise 100 liters of water through a height of 200 meters in one minutes
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