A can do a piece of work in 5 days, B in 10 days. How long will they take to do it together?A3 1/3 daysB15 daysC7 1/2 daysD2 daysAnswer: A. 3 1/3 days Read Explanation: [xy / x+y days] (10 x 5) / 15 = 10/3 days = 3 1/3 daysRead more in App