Time & Work

What you'll learn

The unitary trick: turn 'days' into 'work per day', add them up, and Time & Work becomes easy.

This chapter has

Time & Work — solved practice questions

6 SSC / Banking Quantitative Aptitude questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   A can complete a work in 10 days. What part of the work does he do in 1 day?

   • A1/5
   • B1/10
   • C10
   • D1/20
   Show answer & solution

   Correct answer: (B) 1/10

   1 day's work = 1 / (total days) = 1/10.

2. Q2medium

   A can do a job in 6 days and B in 12 days. Working together, what part do they finish in 1 day?

   • A1/4
   • B1/8
   • C1/18
   • D1/3
   Show answer & solution

   Correct answer: (A) 1/4

   1/6 + 1/12 = 2/12 + 1/12 = 3/12 = 1/4.

3. Q3medium

   A can do a job in 6 days and B in 12 days. Working together, in how many days will they finish it?

   • A3
   • B4
   • C8
   • D18
   Show answer & solution

   Correct answer: (B) 4

   Together's 1-day work = 1/4, so they finish in 4 days.

4. Q4medium

   A is twice as efficient as B. If B alone finishes a work in 12 days, how long will A take?

   • A12
   • B6
   • C24
   • D8
   Show answer & solution

   Correct answer: (B) 6

   Twice as efficient → half the time = 12/2 = 6 days.

5. Q5medium

   4 men build a wall in 10 days. How long will 8 men take, working at the same rate?

   • A10
   • B5
   • C20
   • D2.5
   Show answer & solution

   Correct answer: (B) 5

   Double the men → half the time = 10/2 = 5 days.

6. Q6hard

   A can do a work in 15 days and B in 10 days. What part do they complete together in one day?

   • A1/6
   • B1/5
   • C1/25
   • D1/3
   Show answer & solution

   Correct answer: (A) 1/6

   1/15 + 1/10 = 2/30 + 3/30 = 5/30 = 1/6.

Want the full set? Practise all 6 Time & Work questions →