Question

40 2 707
There are 3 pipes P, Q and R, which could fill a certain There are 3 pipes, P,Q and R which could fill a certain container in 38, 44 and 28 minutes
respectively. The container is initially empty. Pipe P is opened at 9:41 a.m. 8 minutes later,
pipe Q is opened. How many minutes after this should pipe R be opened so that the con-
tainer will get filled at exactly 10 am.?

Answer 1

Answer:

the answer is 4

Step-by-step explanation:

let work be 1 unit

we could understand that p was there for the whole time so,

p=19

whereas q opened after 8 minutes i.e 9:49 so

q=19-8=11

let r be unknown, so consider it as x

now,

19(1/38) + 11(1/44) + x(1/28) = 1

we get x = 7

r opened at 9: 53

after q started r opened for 4 minutes