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 Class 8 mathematics questions and answers on indirect proportion

Six taps take 5 hours to fill the tank with water. How much longer will 4 similar taps take to fill the tank?
A.# 2frac{1}{2}#
B. # 7frac{1}{2}#
C. # 12frac{1}{2}#
D. 25h

 (3m 7s)
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