7 hrs
7 hrs 30 min
5 hrs
5 hrs 30 min
B. 7 hrs 30 min
Net part filled In 1 hour =(1/10)+(1/12)-(1/20)=(8/60)=(2/15).
The tank will be full in 15/2 hrs = 7 hrs 30 min.
100 hrs
122 hrs
177 hrs
112 hrs
7 hrs
7 hrs 30 min
5 hrs
5 hrs 30 min
10 min
20 min
40 min
50 min
39 min
40 min
50 min
45min
18 hrs
13 hrs
20 hrs
23 hrs
20 hrs
23 hrs
30 hrs
21 hrs