Question

taps X and Y can fill up an Empty tank in 15 and 12 hour respectively honour tab Z can empty the full tank in 8 hours if all the tabs are turned on together at same time in how many years will the tank be half full


Ans is :- 20 hours​

Answer 1

Step-by-step explanation:

tank emptied by x=1/15

tank emptied by y=1/12

tank emptied by z=1/8

tank emptied by them altogether

=1/12+1/15-1/8=30+24-45/360

=9/360

=1/40

the time taken =1/2*40/1

=20hours