An inkjet printer can print 8 lines/second and can print a document in 6 minutes. How much time would an LED printer take to print the same document if it can print 7 lines/second more than the inkjet printer?
Answer & explanation
Correct answer: option 3
1 minute = 60 seconds
6 minutes = 60 x 6 seconds = 360 seconds
Total lines in the document = 8 x 360
= 2880 lines, ..(1.)
LED printer
Speed of LED printer = 8 + 7 = 15 lines/second ..(2.)
Time taken by LED printer to print the document = (1)/(2)
⇒ \(\frac{2880}{15}\) = 192 seconds
⇒ 192 x \(\frac{1}{60}\) = 3 minutes 12 seconds.