wo pipes X and Y fill a tank in 15 hrs. and 20 hrs. respectively, while a third pipe ‘Z’ can empty the full tank in 25 hrs. All the three pipes are opened in the beginning. After 10 hrs. Z is closed. In how much time, will the tank be full ? January 31, 2021 / By Preparation Point / Mathematics Mcqs Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedInA. 12 hrs B. 14 hrs C. 16 hrs D. 18 hrs Explanation: Part filled in 10 hrs. = 10[1/15+1/20−1/25]=23/30 Share this:TwitterFacebookMoreTelegramWhatsAppLike this:Like Loading... Related Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedIn