Multiple choice

Two pipes A and B can fill a tank in 12 minutes working together. If pipe A can fill the tank in 20 minutes, the time taken to fill the tank by B is - दो पाइप A और B एक टंकी को 12 मिनट में भर सकते हैं। यदि पाइप A टंकी को 20 मिनट में भर सकती है, तो पाइप B द्वारा टंकी को भरने में लिया गया समय है -

  1. 25 minutes/मिनट

  2. 18 minutes/मिनट

  3. 30 minutes/मिनट

  4. 40 minutes/मिनट
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When pipes work together, their rates add up. Pipe A's rate is 1/20 tank per minute. The combined rate of A and B is 1/12 tank per minute. Therefore, B's rate is 1/12 - 1/20 = 1/30 tank per minute, which means B alone takes 30 minutes to fill the tank.

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