A teacher has 3 hours to grade all the papers submitted by the 35 students in her class. She gets through the first 5 papers in 30 minutes. How much faster does she have to work to grade the remaining papers in the allotted time?
A. 10%
B. 15%
C. 20%
D. 25%
E. none of these
Explanation: প্রথম 5 টি copy এর প্রত্যেকটি দেখতে সময় লাগে \((30/5) = 6\) মিনিট। পরের 30 টি copy এর প্রত্যেকটি দেখতে সময় লাগবে \((150/30) = 5\) মিনিট। অতএব, \((1/6 \times 100) = 16.67\%\) faster হতে হবে। (None of these).
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