Question : 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?
Option 1: 2 min 54 sec
Option 2: 2 min 50 sec
Option 3: 3 min 12 sec
Option 4: 3 min 4 sec
Correct Answer: 3 min 12 sec
Solution :
Given,
An inkjet printer can print 8 lines/second and can print a document in 6 minutes. An LED printer can print 7 lines/second more than an inkjet printer.
We know,
Work done = rate × time
⇒ Number of lines in the document = 8 × 6 × 60 = 2880
⇒ Time taken for LED printer = $\frac{2880}{15}$ = 192 sec = 3 min 12 sec
Hence, the correct answer is 3 min 12 sec.
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