Multiple choice

A is thrice as efficient as B and B is twice as efficient as C, if A, B and C work together how long would they take to complete a job that B takes 10 days to complete? A, B से तिगुना अधिक कार्यकुशल है और B, C से दुगुना कार्यकुशल है, यदि A, B और C एक साथ काम करके कितने दिनों में पूरा करेंगे जबकि B, 10 दिनों में पूरा करता है -

  1. 20/9 days/दिन

  2. 11/9 days/दिन

  3. 3 days/दिन

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

Efficiency A:B:C = 6:2:1. B's rate = 1/10. Combined rate = 6/20 + 2/20 + 1/20 = 9/20 job per day. Time = 20/9 days.

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