To take advantage of last weekend, mr. elias and his wife went to a rural tourism house in
serra da estrela. there was a large watering tank with 5 equal taps that
water. after some observations and experiences, mr. elias found that:
 with the 5 taps fully open and the watering outlet also open, the tank takes 2 hours to
to fill;
 with 3 taps fully open and the outlet also functioning, it took 3 hours and 45
minutes for the tank to fill.
is it just that with a faucet running and the outlet also running the tank comes to fill? if yes, in
how long?