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What is the time required to punch 1500 cards of 50 column each at the rate of 10,000 punches per hour?

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What is the time required to punch 1500 cards of 50 column each at the rate of 10,000 punches per hour?
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  1. 1500 Cards
    50 Columns
    =>1500*50=75,000
    10,000punches=1hour
    thus
    75,000/10,000=7.5
    Thus
    7 and a half hours ie 7 hrs 30 min