Aptitude - If A can copy 50 pages in 10 hours and A and B together can copy 70 pages in 10 hours, how much time

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If A can copy 50 pages in 10 hours and A and B together can copy 70 pages in 10 hours, how much time does B takes to copy 26 pages?

if anyone know the ans for this apps question pls tell me

Total Answers and Comments: 5

Last Update: March 19, 2007 Asked by: Raji

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October 30, 2006 10:48:23

Satyaki Roy

RE: If A can copy 50 pages in 10 hours and A and B tog...

A can copy 50 pages in 10 hrs.

A can copy 5 pages in 1hr.(50/10)

now A & B can copy 70 pages in 10hrs.

thus, B can copy 90 pages in 10 hrs.[eqn. is (50+x)/2=70, where x--> no. of pages B can copy in 10 hrs.]

so, B can copy 9 pages in 1hr.

therefore, to copy 26 pages B will need almost 3hrs.

since in 3hrs B can copy 27 pages.

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November 15, 2006 17:06:22

itwasnoteasy

RE: If A can copy 50 pages in 10 hours and A and B tog...

you assumed that they together can copy 140 pages coz' 70 per head, which is wrong. its clearly mentioned 70 pages together. if you go by your way it would 140-50 = 90 which B can copy in 10 hrs. which is not right.Rather, 70-50 = 20, which B can copy in 10 hrs. so B would copy 26 pages in:(26/20)*10 = 13 hrs.

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December 20, 2006 04:24:46

Vijayakumar

RE: If A can copy 50 pages in 10 hours and A and B tog...

Little elaborative

If A can copy 50 pages in 10 hour, Then

A = 50,

If A + B can copy 70 pages in 10 hour, then say

A + B = 70

B = 70 - 50 (Substituted A's value since A can copy 50 pages in 10 hour)

B = 20 but for 10 hours.

20 pages = 10 hour

1 page = 10/20 => 0.5hr

26 pages = (26 * 0.5) or (26 * 1/2)

26 pages = 13 hour

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February 14, 2007 02:03:28

Ranganath

RE: If A can copy 50 pages in 10 hours and A and B tog...

A can type 5 pages in an hour 50/10A and B can type 7 pages in one hour 70/10A and B 7 pages and A alone types 5 pages in one hour so diff s 2 pages so B types 2 pages in one hour for B2 pages -1 hour26 pages - x hoursso b can type 26 pages in 13 hours

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March 19, 2007 00:23:14

RANA

RE: If A can copy 50 pages in 10 hours and A and B tog...

1.5 hrs

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