Question

Please solve the question no 8,9

Answer 1

A tap can fill tank in 1 minute=1/48.
1 hour=60minute
2 hour=60×2=120minute.
A tap can empty tank in 1 minute=1/120
They can fill tank in=1/48-1/120
=3/240
=1/80.
Therefore,1÷1/80=80minute.
80minute=1hour 20 minute.
Now add 1 hour 20 minute in 11:40am.
Therefore,11:40+1:20=12:60.
12:60 is written as 1:00pm.

Work done by A in 1 day=1/16.
". ". ". B. ". ". =1/20.
". ". ". C. ". ". =1/30.
(A+B+C)'s can do in 1 day =1/16+1/20+1/30
=35/240
=7/48
Therefore,1÷7/48=48/7.
A.T.Q,
(A+B+C)'s work =48/7×7/2
=24days.