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A can write 75 pages in 25 hrs. A and B together can write 135 pages in 27 hrs. In what time can B write 42 pages ?

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A can write 75 pages in 25 hrs. A and B together can write 135 pages in 27 hrs. In what time can B write 42 pages ? 

(a) 17 hrs 

(b) 19 hrs 

(c) 21 hrs 

(d) 23 hrs

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1 Answer

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Best answer

Correct option (c) 21 hrs

Explanation: 

B’s efficiency = (A+B)’s efficiency - A’s efficiency

= 5-3 = 2 pages/hr 

B’s time 2 page in 1 hr 

42 page in 21 hrs

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