Pipe A and pipe B running together can fill a cistern in 6 minutes. If B takes…
2023
Pipe A and pipe B running together can fill a cistern in 6 minutes. If B takes 5 minutes more than A to fill it, then the time in which A and B will fill that cistern separately will be, respectively, _____________.
- A.
15 min and 10 min
- B.
15 min and 20 min
- C.
25 min and 20 min
- D.
10 min and 15 min
Attempted by 3 students.
Show answer & explanation
Correct answer: D
Let pipe A take a minutes and pipe B take a + 5 minutes. Then 1/a + 1/(a+5) = 1/6, which gives a = 10 and B = 15.