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?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 3 min 12 sec
An inkjet printer can print 8 lines/second and can print a document in 6 minutes.
1 minutes = 60 seconds
6 minutes = 60 x 6 seconds = 360 seconds
Total lines in the document = 8 x 360
= 2880 lines Eq.(i)
The LED printer takes to print the same document if it can print 7 lines/second more than the
inkjet printer.
Speed of LED printer = 8+7 = 15 lines/second Eq.(ii)
time is taken by the LED printer to print the document =
Eq.(i)/Eq.(ii)
= 2880/15
= 192/60 minutes
= 3 minutes 12 seconds