Time and Work (RRB)

If A does work in m days: A's rate = 1/m per day.

Two persons: combined rate = 1/A + 1/B. Together time = AB/(A+B).

Pipes & Cisterns:

• Fill pipe: positive (+1/t).
• Drain pipe: negative (−1/t).
• Net rate = sum.

Efficiency comparison:

• A:B efficiency = 3:2 ⇒ time ratio = 2:3.
• If A alone takes 10 days at efficiency 3, B alone takes 15 days.

Men-Days-Work formula:
(M1 × D1 × H1) / W1 = (M2 × D2 × H2) / W2.

Wages:
Share in ratio of (rate × time worked).

Common questions:

1. Joint work time.
2. One leaves midway / starts late.
3. Pipe fills + drain — net time.
4. Wages distribution in ratio.
5. Men-days conversion.