Question

three tapes take 6 hours,8 hours and 12 hours respectively ifto fill a tank .all three taps were allowed to run for 2 hours and then first and second taps were closed how long will it take third tap to fill the remaining tank

Answer 1

let volume be 24

so in 1 hour tapes fills 4,3,2

in 2 hours tapes fills 8,6,4

After 2 hours first and second are closed

so 8+6+4 = 18

rest ( 24-18) = 6 will be filled by 3 rd

As 3 rd fills 2 in 1 hour

so 6 will be filled by tap in 3 hours