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3) 46 cm
4) 50 cm 5) 60 cm
-4. Two pipes A and B can fill the tank in 24 hrs and 32 hrs respectively. If the water
tank is two fifth full, how much time will it take to completely fill the tank when
both the pipes are opened simultaneously ?
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Answer:
A's one hour work = 1/24
B's one hour work = 1/32
(A + B )' s one hour work = 1/24 + 1/32
= 7/96
work require = 1 - 2/5
= 3/5
Let, the required time be x.
It is case of direct variation.
7/96/1 = 3/5/x
> 7/96 = 3/5x
> 1/x = 7/96 × 5/3
> 1/x = 35/ 288
> x = 288/35
> x = 8.2 hrs
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