An empty bucket being filled with paint at a constant rate takes 6 min to be filled 7/10 of its capacity. How much more time will it take to fill the bucket to full capacity.

A 18/7

B 6/19

C 20/14

D 18/14

Correct Answer: Option A

Solution:

7/10 part taken = 6 m

1 part taken = 6 \( \times \) 10/7 (প্রথমবারের ভগ্নাংশ উল্টিয়ে গুণ হয়)

3/10 part taken = 6 \( \times \) 10/7 \( \times \) 3/10 = 18/7 (দ্বিতীয়বারের ভগ্নাংশ সরাসরি গুণ হয়)