Multiple choice

A can do a work in 15 days and B in 30 days. If they work on it together, then in how many days will they be able to do 50% of the work? A एक कार्य को 15 दिनों में और B उसे 30 दिनों में कर सकता है। यदि वे इस पर एक साथ काम करते हैं, तो वे कितने दिनों में 50% काम कर पाएंगे?

  1. 5

  2. 6

  3. 4

  4. 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A's work rate is 1/15 per day, B's rate is 1/30 per day. Together they do 1/15 + 1/30 = 3/30 = 1/10 of the work per day. So they complete the full work in 10 days. For 50% of the work, they need 10 × 0.5 = 5 days.

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