20 hrs
23 hrs
30 hrs
21 hrs
D. 21 hrs
work done by the leak in 1 hour=(1/3)-(1/(7/2))=(1/3)-(2/7)=(1/21).
The leak will empty .the tank in 21 hours.
18 hrs
13 hrs
20 hrs
23 hrs
39 min
40 min
50 min
45min
20 hrs
23 hrs
30 hrs
21 hrs
7 hrs
7 hrs 30 min
5 hrs
5 hrs 30 min
100 hrs
122 hrs
177 hrs
112 hrs
10 min
20 min
40 min
50 min