Working together, printer A and printer B would finish the task in 10 minutes. Printer A alone would finish the task in 30 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?  Choose the correct choice from the following answers:
A) 125  B) 150  C) 175  D) 200  E) 225
10*A + 10*B = x pages   in 10 mins printer A will print = 10/30 * x pages = 1/3*x pages   thus in 10 mins printer printer B will print x - 1/3*x = 2/3*x pages   Also it is given that printer B prints 5 more pages per min that printer A. In 10 mins printer 150 will print 50 more pages than printer A   thus 2/3*x - 1/3*x = 50 =&gt; x = 150 pages   Answer : 150
<result>B</result>
Working together, printer A and printer B would finish the task in 10 minutes. Printer A alone would finish the task in 30 minutes. How many pages does the task contain if printer B prints 5 pages a minute more than printer A ?