A track of 100 m can be built by 7 men or 10 women in 10 days. How many days will 14 men and 20 women take to build a track of 600 m?
Explanation:
Let efficiency of each man and woman be m and w units/day.
Given, 7m × 10 = 10w × 10 ⇒ 7m = 10w
Now, ⇒ 7m×10100=(14m+20w)×d600
⇒ 7m×101=(14m+14w)×d6
⇒ 7m × 10 × 6 = 28m × d
⇒ d = 15 days
Hence, option (a).
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