# Time and Work Questions

FACTS  AND  FORMULAE  FOR  TIME  AND  WORK  QUESTIONS

1. If A can do a piece of work in n days, then A's 1 day's work =$\frac{1}{n}$

2. If A’s 1 day's work =$\frac{1}{n}$, then A can finish the work in n days.

3. A is thrice as good a workman as B, then:

Ratio of work done by A and B = 3 : 1.

Ratio of times taken by A and B to finish a work = 1 : 3.

NOTE :

Hence,

Whole work is always considered as 1, in terms of fraction and 100% , in terms of percentage.

In general, number of day's or hours = $\frac{100}{Efficiency}$

Q:

Parimal has done 1/4th of a job in 10 days, Salim completes the rest of the job in 20 days. In how many days can they together do the job?

 A) 8 days B) 24 days C) 12 days D) 16 days

Explanation:

0 421
Q:

A, B and C together can complete a work in 25 days. If the ratio of efficiency of A, B and C is 15 : 10 : 6 respectively, then in how many days C alone can complete the same work?

 A) 727/6 B) 725/6 C) 775/6 D) 745/6

Explanation:

0 417
Q:

Murad can do a piece of work in 33 hours. If he is joined by Joel who is 100% more efficient, in what time will they together finish the work?

 A) 4 hours B) 6 hours C) 2 hours D) 11 hours

Explanation:

0 415
Q:

P and Q can do a project in 20 and 12 days respectively. In how many days can they complete 40% of the project if they work together?

 A) 1.5 days B) 3 days C) 6 days D) 9 days

Explanation:

3 415
Q:

A & B together finish a job in 24 days, while A, B & C together can finish the same job in 8 days. C alone will finish the job in

 A) 12 days B) 14 days C) 16 days D) 24 days

Explanation:

3 413
Q:

A can do a work in 15 days and B in 9 days. If they work on it together for 5 days, then what fraction of work is left?

 A) 1/6 B) 3/7 C) 1/3 D) 1/9

Explanation:

0 413
Q:

If 10 people can do a job in 20 days,then 20 people with twice the efficiency can do the same job in

 A) 5 days B) 10 days C) 20 days D) 40 days

Explanation:

2 408
Q:

Mahmood can do a piece of work in 40 hours. If he is joined by Janaki who is 50% more efficient, in what time will they together finish the work?

 A) 2 hours B) 6 hours C) 16 hours D) 3 hours