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14 सेमी. व्यास वाले पाईप से किसी 50 मी. लम्बे तथा 44 मी. चौड़े टैंक में 5 किमी/घंटा की चाल से पानी गिरता है। पानी की सतह का 7 सेमी. ऊंचा उठने में लगा समय (घंटे में) ज्ञात करें?
A. 2
B. `1 1/2`
C. `3`
D. `2 1/2`

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माना टैंक को भरने में लगा समय
`=x` hrs
`implies(pir^(2)h)xx x=50xx44xx7/100`
`implies x=(50xx44xx7xx7xx100xx100)/(22xx7xx7xx100xx50000`
`=2hrs`

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