Static GK for Railway Group D & NTPC CBT 2 | Rank & Index 2021 - 22 | Day - 07

Each of A, B, C and D need a umique time to do a certain work. A can do the work in x days and B can do the work in 2x days. A started the work and do it for 22 2/9 days then he is replaced by B and B completed remaining work in same time as C and D together can complete the whole work. The ratio of the efficiency of C and D is 4: 5 . If C and D work for alternative days starting form C then they can do the total work in 44 1/2 days.

Each of A, B, C and D need a unique time to do a certain work. A can do the work in x days and B can do the work in 2x days. A started the work and do it for 22 2/9 days then he is replaced by B and B completed remaining work in same time as C and D together can complete the whole work. The ratio of the efficiency of C and D is 4: 5. If C and D work for alternative days starting form C then they can do the total work in 44 1/2 days. Find the value of x

A rail track made of steel having 20m is clamped on a railway line at its two ends as show in Fig. 7(d). 17. On a summer day due to rise in temperature by 22^(@)C , it is deformed as show in Fig. 7(d). 17 .Find displacement of the center (x) . Given cofficient of liner expansion of steel is 1.2xx10^(-5) .^(@)C^(-1) .

A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With the help of C, they did the job in 4 days only. Then, C alone can do the job in 9 1/5d a y s b. 9 2/5d a y s c. 10 d a y s d. 9 3/5d a y s

Paragraph for question nos. 9 to 11 Consider the conic C Q.9 16 12 Equation of circle touching Cat one extremity of latus-rectum and centre ofC is/are (A) 8x 8y2 19x passing throu 22y 0 (B) 8x 8 19x 22y 0 (C) 8x 8y2 19x 22y 0 (D) 8x2 8y2 19x -22y 0 Q.10 The equation of parabolas with same latu as conic C,isare 6x 21 0 (C) y (D) y Q.11 f a hyperbola passes through extremities minor axis of conic C and its transverse and conjugate axis coincides with the minor and major axis of conic C respectively, and the product of eccentricity of hyperbola and conic Cis 1.then (A) equation of hyperbola is A- l. (B) equation of hyperbola is *-1 (C) focus of hyperbola is (0, 2 3) (D) focus of hyperbola is (0,- 07-06-17 20202

A is thrice as good a workman as B and so takes 60 days less than B for doing a job. The time in which they can do the job together is a. 22 1/2d a y s b. 30 d a y s c. 4 d a y s d. 60 d a y s

If 5 men and 3 women can reap 18 acre of crop in 4 days; 3 men and 2 women can reap 22 acre of crop in 8 days,then how many men are required to join 21 women to reap 54 acre of crop in 6days? 5 b.backslash6 c.10 d.12

A group of workers having equal efficiency can complete a job in 4 days. But it so happened that every alternate day starting from the second day, 3 workers are withdrawn from the job and every alternate day starting from the third day, 2 workers are added to the group. If it now takes 7 days to complete the job, find the number of workers who started the job. 4 b. 5 c. 6 d. 8