two pipes AandB can fill empty tank in 8 hr and 12 hr respetively ,if the pipes are opened alternative ly every hour,the tank will be full earlier if
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Step-by-step explanation:
Tank position at 3pm is
1/4 +1/12=4/12=1/3 full
To be filled is 2/3
All are open at 3pm
Effective filling per hour is
1/8 +1/12–1/6=(3+2-4)/24=1/24th per hour
Time to fill full is 24 hrs
Time to fill 2/3=24*2/3=16 hrs
Time of filling is next day morning 7 AM
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