Four taps supply water to the pond in Trafalgar
Square in London.
The first tap can fill the pond by itself in one hour
The second tap can fill it in two hours, the third tap
in three hours, and the fourth tap in four hours
Steven, a city worker, turns on all the taps at the
same time.
How much time (to the second) is needed to fil
the Trafalgar Square pond? Svp aider moi c’est pour un dm