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Mathematics
Problem
If a pipe can fill a cistern in 6 hours and another pipe can empty the cistern in 15 hours, then what part of the cistern will be filled in 1 hour, if both pipes are opened simultaneously? A.
1
40
\frac{1}{40}
40
1
B.
1
30
\frac{1}{30}
30
1
C.
1
35
\frac{1}{35}
35
1
D.
1
10
\frac{1}{10}
10
1
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