A large tanker can be filled by two pipes Aand Bin 60 minutes and 40 minutes, respectively. How many minutes will it take to fill the empty tanker if only Bis used in the first-half of the time and Aand Bare both used in the second-half of the time?A. 15B. 20C. 27.5D. 30

Harshit Singh , 2 Years ago

Grade 12th pass