Multiple choice

A and B can finish a work in 30 days, B and C can finish it in 15 days while C and A can finish it in 10 days. Time taken by them together to do this work is- A और B किसी कार्य को 30 दिन में समाप्त कर सकते हैं, B और C इसे 15 दिन में जबकि C और A इसको 10 दिन में समाप्त कर सकते हैं । इस कार्य को उनको एक साथ पूरा करने में लिया गया समय है -

  1. 15 days/दिन

  2. 10 days/दिन

  3. 18 days/दिन

  4. 20 days/दिन
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let total work = LCM(30,15,10) = 30 units. Combined rates: A+B = 1 unit/day, B+C = 2 units/day, C+A = 3 units/day. Adding all three: 2(A+B+C) = 6, so A+B+C = 3 units/day. Time together = 30/3 = 10 days.

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