Multiple choice

A and B together can do a piece of work in 12 days. If A does thrice as much work as B in a given time, find how long A alone would take to do the work? A और B एक साथ एक कार्य 12 दिन में पूरा करते हैं। यदि A,B की अपेक्षा उतने ही समय में 3 गुना अधिक कार्य करता है तो A को अकेले उस कार्य को पूरा करने में कितना समय लगेगा?

  1. 18

  2. 12

  3. 15

  4. 16
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A does 3 times the work of B, so if B's rate = r, A's rate = 3r. Combined rate = 4r. Together: 4r × 12 = 1 work, so r = 1/48. A's rate = 3/48 = 1/16. A alone: 16 days.

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