alleryબે પાઇપ એક ટાંકીને અનુક્રમે 20 અને 30 કલાકમાં ભરે છે, અને ત્રીજી પાઇપ તેને 60 કલાકમાં ખાલી કરે છે. બધી પાઇપ ખુલ્લી હોય, તો તે ભરાશે:
A15 કલાક
B18 કલાક
C10 કલાક
D12 કલાક
Answer & Solution
Correct answer: A. 15 કલાક
ચોખ્ખો દર પ્રતિ કલાક 3/60 + 2/60 - 1/60 = 4/60 = 1/15 છે, તેથી 15 કલાક.
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