Exams › IBPS PO › Quantitative Aptitude

Pipe A fills tank in 16 min, B empties in 24 min. Both open; B closed after x min, tank full in 30 min. Find x.

1. 21 minutes
2. 20 minutes
3. 18 minutes
4. 15 minutes

Correct answer: 21 minutes

Solution

Net rate with both pipes: 1/16-1/24=1/48. For x min both open, then only A for (30-x) min. x/48+(30-x)/16=1. Multiply by 48: x+3(30-x)=48 → x+90-3x=48 → -2x=-42 → x=21 min.

Related IBPS PO Quantitative Aptitude questions

• Shobhit is twice as efficient as Rohit. Rohit is twice as efficient as Mohit. All three together complete work in 20 days. In how many days can Rohit and Shobhit together complete the work?
• B's 1-day work = 1/200. A's efficiency is 5/3 times that of B. In how many days can A alone complete the work?
• A and B together complete work in 4 days. A alone takes 6 days less than B alone. C is 50% more efficient than B. In how many days can C alone complete the work?
• A and B together fill a tank in 36 minutes. B closed after 30 minutes; tank fills in 40 minutes total. Find time for B alone.
• A alone takes 6 hours more than A+B together. B alone takes 1.5 hours more than A+B together. How long do A and B take together?
• Pipe A fills tank in 6 hours. With a leak, it takes 9 hours. In how many hours can the leak alone empty the full tank?

⚔️ Practice IBPS PO Quantitative Aptitude free + battle 1v1 →