Multiple choice

A and B can together finish a work in 60 days. They worked together at it for 40 days and then B left. The remaining work was done by A alone in 20 more days. A alone can finish the work in - A तथा B एक साथ मिलकर एक कार्य 60 दिनों में पूरा कर सकते है। उन्होंने वह कार्य 40 दिनों तक किया, उसके बाद B कार्य छोड़ कर चला गया। तब शेष कार्य को A ने अकेले, 20 दिन अधिक लगाकर पूरा किया। तद्नुसार A अकेला पूरा कार्य कितने दिनों में कर सकता था?

  1. 40 days/दिनों

  2. 60 days/दिनों

  3. 75 days/दिनों

  4. 80 days/दिनों
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B Correct answer
Explanation

Let A's rate = a, B's rate = b. Combined: a + b = 1/60. In 40 days, they complete 40/60 = 2/3 of work. Remaining work = 1/3, done by A in 20 days. So A's rate a = (1/3)/20 = 1/60. Therefore A alone takes 60 days.

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