Question

three taps A,B and C can fill an overhead tank in 6 hours,8 hours and 12 hours respectively.How long would the three taps take to fill the empty tank, if all of them are opened together

Answer 1

Time taken by three taps = reverse of (1/6+1/8+1/12)=reverse of (4/24+3/24+2/24)=reverse of (9/24)=

24/9 hours = 2.666...hours . I hope you understood .