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gibran · 07-11-2008, 08:06 PM

Three machines have the identical rate. If two of them work together, it takes k hours to complete a certain work. If all of them work together, it takes two hours less to complete the same work. K=?
(A) 4
(B) 6
(C) 10
(D) 12
(E) 14

OA:

SPOILER: B

07-11-2008, 08:06 PM	#1 (permalink)
gibran Within my grasp! Join Date: Nov 2005 Posts: 281	rate problem Three machines have the identical rate. If two of them work together, it takes k hours to complete a certain work. If all of them work together, it takes two hours less to complete the same work. K=? (A) 4 (B) 6 (C) 10 (D) 12 (E) 14 OA: SPOILER: B