puzzle

SWETHA007 · 18-05-06, 03:28 PM

explanation plz

!).a
multiple phtostat copier can create 120 copies in 30 seconds.how much time
would it take to from 2000 copies on two such machines working simultaneously.

a)4min
08sec b)4min 10sec c)4min 25sec d)4min 30sec

iCanSolveIt · 19-05-06, 01:09 AM

ans. the ans is b) 4min 10sec

winner · 20-05-06, 01:00 AM

the sol is

time I II total

30sec 120 120 240

60sec120120 480

90sec120 120 720

120sec 120 120 960

150sec120120 1200

180sec120 120 1440

210sec1201201680

240sec 120 120 1920

rem 2000-1920=80copies

120 copies in 30 sec

80 copies in (30*80)/120=2400/120=20sec

therefore 240+20=260sec=(260/60)=13/3=4 1/3=4min 20sec

ans:4min 20sec

iCanSolveIt · 20-05-06, 05:54 AM

ya budy u r write

gud keep it up

jsangeetha · 20-05-06, 09:45 AM

Sorry ... I did not find 4min 20sec in the options given.

The ans I think is b)4min 10sec .

The problem was right till 1920 option. But after that for 80 copies we need 20 sec. But that 80 can be divided into 40 each and taken in the two copiers. So its actually only 10 sec.

Pls correct me if I'm wrong.

winner · 20-05-06, 09:53 AM

ya u r correct thanks for correcting me

19-05-06, 01:09 AM	#2 (permalink)
iCanSolveIt Junior Member Join Date: May 2006 Location: India Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 3	ans. the ans is b) 4min 10sec __________________ If it\'s true that we are here to help others, Then what exactly are the others here for?

20-05-06, 01:00 AM	#3 (permalink)
winner Senior Member Join Date: Feb 2006 Location: India Posts: 237 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 5	the sol is time I II total 30sec 120 120 240 60sec120120 480 90sec120 120 720 120sec 120 120 960 150sec120120 1200 180sec120 120 1440 210sec1201201680 240sec 120 120 1920 rem 2000-1920=80copies 120 copies in 30 sec 80 copies in (30*80)/120=2400/120=20sec therefore 240+20=260sec=(260/60)=13/3=4 1/3=4min 20sec ans:4min 20sec __________________ success==hardwork meena

20-05-06, 05:54 AM	#4 (permalink)
iCanSolveIt Junior Member Join Date: May 2006 Location: India Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 3	ya budy u r write gud keep it up __________________ If it\'s true that we are here to help others, Then what exactly are the others here for?

20-05-06, 09:53 AM	#6 (permalink)
winner Senior Member Join Date: Feb 2006 Location: India Posts: 237 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 5	ya u r correct thanks for correcting me __________________ success==hardwork meena

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18-05-06, 03:28 PM	#1 (permalink)
SWETHA007 Junior Member Join Date: May 2006 Location: Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 3	explanation plz !).a multiple phtostat copier can create 120 copies in 30 seconds.how much time would it take to from 2000 copies on two such machines working simultaneously. a)4min 08sec b)4min 10sec c)4min 25sec d)4min 30sec

20-05-06, 09:45 AM	#5 (permalink)
jsangeetha Senior Member Join Date: Apr 2006 Location: Posts: 151 Thanks: 0 Thanked 4 Times in 4 Posts Thanks: 0 Thanked 4 Times in 4 Posts Rep Power: 4	Sorry ... I did not find 4min 20sec in the options given. The ans I think is b)4min 10sec . The problem was right till 1920 option. But after that for 80 copies we need 20 sec. But that 80 can be divided into 40 each and taken in the two copiers. So its actually only 10 sec. Pls correct me if I'm wrong.

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