Two pipes A and B can fill a cistern in 3 hours and 5 hours respectively. Pipe C can empty in 2 hours. If all the three pipes are open, in how many hours the cistern will be full?

Question

নিচের অপশন গুলা দেখুন

• 30 hours
• 10 hours
• can’t be filled
• 15 hours

Answer 1

সঠিক উত্তর হচ্ছে: 30 hours

ব্যাখ্যা: Part of cistern filled by three pipes in an hour
=1/3 + 1/5 -1/2
=(10+6-15)/30
=1/30
Hence, the cistern will be filled in 30 hours.