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Answer

work=120

A 1hr=5

B 1hr=4

C 1hr=2

5part in 2hr

120part in 2/5*120=48hr

Answer
It take to fill tank is 48hr, Take lcm of 24,30,60=120 a=5unit/hr b=4u/hr c=2unit/hr every 2hrs tank is filled=(5-2)+(4-2)=5unit total 120unit in 120*2/5=48 hr
Answer
take lcm of 24,30,60=120 a=5unit/hr b=4u/hr c=2unit/hr every 2hrs tank is filled=(5-2)+(4-2)=5unit total 120unit in 120*2/5=48 hr
Answer
in 1 hour A can fill 1/24th of the tank. in 1 hour B can fill 1/30th of the tank. in 1 hour C can empty 1/60th of the tank. First A fills for 1 hour then in 2nd hour B fills but C empties for 2 hours .so in 2 hours C will empty 2(1/60)th of the tank. so net water in the tank in these 2 hours will be (1/24 )+(1/30) -2(1/60) part of the tank. simplifying we get net water in the tank in 2 hours will be 1/24 th of the tank. so net water in 1 hour will be (1/24)/2= 1/48 th part. so time taken for the tank to be filled completely will be 1/(1/48)= 48 hours.

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