Machine V takes 6 minutes to cut 60 pieces of lumbers. Machine W takes 16 minutes to cut 112 pieces of lumbers. Machine X takes 10 minutes to cut 120 pieces of lumber.
- Which is the faster combination, V and W or W and X? (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 V alone:
6 min → 60 pieces
1 min → 60 ÷ 6 = 10 pieces
Time taken by Machine W alone:
16 min → 112 pieces
1 min → 112 ÷ 16 = 7 pieces
Time taken by Machine X alone:
10 min → 112 pieces
1 min → 120 ÷ 10 = 12 pieces
Time taken by Machine V and Machine W together:
1 min → 10 + 7 = 17 pieces
Time taken by Machine W and Machine X together:
1 min → 7 + 12 = 19 pieces
Machine W and X are the faster combination.
(b)
Number of more pieces of lumbers that can be cut by the faster combination (Machine W and X) in 1 minute
= 19 - 17
= 2
Answer(s): (a) W, X or X, W; (b) 2