It takes six hours for three pipes A, B, and C to fill a tank. C is closed after 2 hours of joint effort, and A and B can fill the remaining half in 7 hours. C alone took the following amount of time to fill the tank:
A. 10
B. 12
C. 14
D. 16
Answer:C
It takes six hours for three pipes A, B, and C to fill a tank. C is closed after 2 hours of joint effort, and A and B can fill the remaining half in 7 hours. C alone took the following amount of time to fill the tank:
A. 10 B. 12 C. 14 D. 16
Explanation: 2/6 = 1/3 = part filled in 2 hours.The remaining portion is equal to 1 - 1/3 = 2/3.7 hours of labour (A + B) = 2/3,1 hour of labour (A Plus B) = 2/21,1 hour of labour by C Equals 1 hour of work by (A + B + C) − (A Plus B) equals 1 hour of labour= 1/6 - 2/21 = 1/14,C can fill the tank in 14 hours by itself.