Question

a tap can fill a tank in 20 hours,while the other can empty it in 30 hours .The tank being empty and if both taps are opened together how long will it take for the tank to be half full. Explain the solution with working .please give correct answer

Answer 1

tank filled in 1 hour =1÷20
tank emptied in 1 hour =1÷30

if both taps are opened together then it will filled in =1÷20 - 1÷30

=3-2÷60
=1÷60

=60 Answer
but it has asked Half
so,
it will be 60/2

=30 Answer.

Answer 2

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