If a cistern has 3 pipes of 1 cm , 4/3 cm and 2 cm thickness ...where the pipe with 2 cm thickness can fill the cistern in 2 hrs and 2 min..then in how much time they can fill the tank? Choose the correct choice from the following choices
A) 53.7min
B) 54.7min
C) 55.7min
D) 56.7min
E) 57.7min
2cm can fill in 122min   thickness inversly propotional to time   total thickness of the pipe=1+4/3+2=4.3   we know that 2cm can fill in 122min   for 4.3cm time =56.7min   ANSWER:56.7min
<result>D</result>
If a cistern has 3 pipes of 1 cm , 4/3 cm and 2 cm thickness ...where the pipe with 2 cm thickness can fill the cistern in 2 hrs and 2 min..then in how much time they can fill the tank?