Multiple choice

A can complete a certain work in 30 days. A started the work and B joined him after 4 days and the work was completed in total 20 days. In how many days can B alone complete the work? A किसी काम को 30 दिन में पूरा कर सकता है। A ने काम करना आरंभ किया और 4 दिन पश्चात B उसके साथ मिल गया तथा काम कुल 20 दिन में पूरा हो गया। B अकेला उसी काम को कितने दिन में पूरा कर सकता है?

  1. 42

  2. 45

  3. 48

  4. 50

  5. None of these इनमे से कोई नहीं
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A works for 4 days alone: 4/30 done. A and B together finish remaining 26/30 in 16 days, so their combined rate is (26/30)/16 = 13/240 per day. A's rate is 1/30 = 8/240. B's rate = 13/240 - 8/240 = 5/240 = 1/48. B alone takes 48 days.

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