Machine X takes 8 minutes to cut 88 pieces of lumbers. Machine Y takes 19 minutes to cut 171 pieces of lumbers. Machine Z takes 11 minutes to cut 143 pieces of lumber.
- Which is the faster combination, X and Y or Y and Z? (Eg A, B)
- In 1 minute, how many more pieces of lumbers can be cut by the faster combination compared to the other combination?
(a)
Time taken by Machine X alone:
8 min → 88 pieces
1 min → 88 ÷ 8 = 11 pieces
Time taken by Machine Y alone:
19 min → 171 pieces
1 min → 171 ÷ 19 = 9 pieces
Time taken by Machine Z alone:
11 min → 171 pieces
1 min → 143 ÷ 11 = 13 pieces
Time taken by Machine X and Machine Y together:
1 min → 11 + 9 = 20 pieces
Time taken by Machine Y and Machine Z together:
1 min → 9 + 13 = 22 pieces
Machine Y and Z are the faster combination.
(b)
Number of more pieces of lumbers that can be cut by the faster combination (Machine Y and Z) in 1 minute
= 22 - 20
= 2
Answer(s): (a) Y, Z or Z, Y; (b) 2