Clock

mj78ind: Master | Next Rank: 500 Posts; Posts: 265; Joined: Mon Dec 28, 2009 9:45 pm; Thanked: 26 times; Followed by:2 members; GMAT Score:760

by mj78ind » Sun Jun 06, 2010 9:14 am

@Raj

Please repost can not see the question

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rahulmehra13: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Wed Jul 22, 2009 8:49 am; Thanked: 4 times

by rahulmehra13 » Sun Jun 06, 2010 9:38 am

dkumar.83 wrote:Hi,

Kindly specify the detailed way to find this answer.

IMO C

1st clock loses 3 min/hr i.e. 72 min/day or 1.2 hr/day

2nd clock gains 5 min/hr i.e. 120 min/day or 2 hr/day

For losing 12 hrs 1st clock takes 10 days (12/1.2)
similarly for gaining 12 hrs 2nd clock takes 6 days (12/2)

Calculate LCM of 6 & 10, you will get 30

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