Discussion
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- Question
- If 12 man or 18 women can do piece of work in 14 days. How long will 8 men and 16 women take to finish the work?
Options- A. 9 days
- B. 12 days
- C. 13 days
- D. 10 days
- Correct Answer
- 9 days
Explanation12 men =18 women
? 1 man = 18/12 women
? 8 men = 18/12 x 8 = 12 women
Given m1 = 18 M2 = 12 +16 = 28,
D1 , D2 = ? and W1 = W2 = 1
According to the formula
M1D1W2 = M2D2W1
? 18 x14 x1= 28 x D2 x1
? D2 = (18 x 14)/28 = 9 days - 1. Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?
Options- A. 14
- B. 28
- C. 42
- D. 35 Discuss
- 2. Three taps A, B and C together can fill a tank in 6 h. After working 2 h, C is closed and the tank was filled in 8 h more. Find the time in which C alone can fill the tank?
Options- A. 12 h
- B. 16 h
- C. 14 h
- D. 18 h Discuss
- 3. Sonu can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijeet joined and completed it working for 10 days. In how many days Sonu and Abhijeet can do the complete work, working together?
Options- A. 6
- B. 8
- C. 10
- D. 12 Discuss
- 4. X is 4 times more efficient as Y , then the number of days taken by X and Y are in the ratio?
Options- A. 8 : 1
- B. 1 : 5
- C. 6 : 8
- D. 5 : 1 Discuss
- 5. Ajit is 3 times as efficient as Bablu, then the ratio of number of days required by each to work alone, completely?
Options- A. 3 : 1
- B. 1 : 3
- C. 6 : 3
- D. 3 : 6 Discuss
- 6. 10 man can make a wall in 8 days. How many men required to complete the same work in half days?
Options- A. 80
- B. 100
- C. 120
- D. 160 Discuss
- 7. 6 boys can complete a piece of work in 16 h. In how many hours will 8 boys complete the same work?
Options- A. 10
- B. 8
- C. 12
- D. 14 Discuss
- 8. In a hostel, there are 120 students and food stock is for 45 days. If 30 new students join the hostel, in how many days will the complete stock be exhausted?
Options- A. 38
- B. 40
- C. 32
- D. 36 Discuss
- 9. If 5 days take 7 h to pack 35 toys, how many boys can pack 65 toys in 3 h?
Options- A. 26
- B. 39
- C. 45
- D. None of these Discuss
- 10. A stock of food is enough for 240 men for 48 days. How long will the same stock last for 160 men?
Options- A. 54 days
- B. 60 days
- C. 64 days
- D. 72 days Discuss
Time and Work problems
Search Results
Correct Answer: 28
Explanation:
Alen's one day's work =1/21
Border's one day's work = 1/42
Alen and Border's two days work(working alternatively) = (1/21) + (1/42) = 1/14
So, Alen and Border do 1/14 work in 2 days
So, they complete the work in 14 x 2 = 28 days.
Correct Answer: 12 h
Explanation:
Work of (A + B + C) in 1 H = 1 / 6
Work done in 2 h = 2/6 = 1/3
Remaining part of the tank = 1 - 1/3 = 2/3
Time taken by A + B to fill this 2/3rd part of the tank = 8 h
A and B together can fill tank in 12 h (i.e., 8 x 3/2).
Now, we have A, B and C together filling the tank in 6 h and A and B together fill tank in 12 h.
Work done by C alone in 1 h = 1/6 - 1/12 = 1/12
Hence, C alone can fill the tank in 12 h.
Correct Answer: 8
Explanation:
Efficiency of Sonu = (100/20) = 5%
Rest work = 75%
? Efficiency of Abhijeet = 75/10 = 7.5%
? Combined efficiency of Sonu and Abhijeet = 7.5 + 5 = 12.5%
? Number of days required by Sonu and Abhijeet, to work togethere = 100/12.5 = 8days
Correct Answer: 1 : 5
Explanation:
Efficiency (X : Y) = 5 : 1
No. of days (X : Y) = 1 : 5
Correct Answer: 1 : 3
Explanation:
Efficiency of Ajit : Bablu = 3 : 1
No. of days 1 : 3
Correct Answer: 160
Explanation:
Given, M1 = 10 D1 = 8, M2 = ? and D2 = 1/2
From M1D1 = M2D2
? 10 x 8 = M2 x 1/2
? M2 = 10 x 8 x 2
? M2 = 160
Correct Answer: 12
Explanation:
Given, M1 = 6, M2 = 8 , T1 = 16 h,
and T2 = ?, W1 = W2 = 1
According to the formula.
M1T1W2 = M2T2W1
? 6 x 16 x 1 = 8 x T2 x 1
? T2 = 16 x 6/8 = 2 x 6 = 12 h
Correct Answer: 36
Explanation:
Let food stock will be exhausted in x days .
Given, m1 = 120, D1 = 45
M2 = 120 + 30 = 150
and D2 = ?
Then, using M1D1 = M2D2
? 120 x 45 = 150 x D2
? D2 = 120 x 45/120 = 36
Correct Answer: None of these
Explanation:
Given, M1 = 5, M2 = ?, T1 = 7, T2 = 3,
W1 = 35 and W2 = 65
According to the formula,
M1T1W2 = M2T2W1
? 5 x 7 x 65= M2 x 3 x 35
? M2 = (5 x 7 x 65)/(35 x 3) = 65/3 boys
Correct Answer: 72 days
Explanation:
M1 = 240, D1 = 48, M2 = 160 and D2 = ?
According to the formula,
M1D1 = M2D2
? 240 x 48 = 160 x D2
? D2= (240 x 48)/160 = 72
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