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Home > past-papers-math > Question

Four men working together can dig a ditch in 42 days. They begin, but one man works only half-days. How long will it take to complete the job:

1
A) 48 days
B) 46 days
C) 50 days
D) 52 days

Correct Answer: A) 48 days

SMART TRICK: Standard Work and Time problem. 4 men ka mukammal total work nikalen: 4 men × 42 days = 168 man-days ka kaam hai. Ab naya scenario dekhein: 3 men full day kaam karte hain (value = 3) aur 1 man half-day kaam karta hai (value = 0.5). Tou daily ka effective manpower = 3 + 0.5 = 3.5 men. Ab total kaam (168) ko daily manpower (3.5) se divide karein: 168 / 3.5 = 48 days. Correct Option (B) 48 days hai.

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20 Aug 2026, 06:52 AM
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