SSC CPO SI and ASI Model Paper 7

Question : 113 of 200

Marks: +1, -0

Pipes P1 and P2 can fill the same tank in 84 minutes and 56 minutes, respectively. Another pipe P3 can empty the same tank in 70 minutes. How much time (in minutes) is required to fill the tank, if all three pipes are opened together?

$32 13 /18$
$58 6/ 23$
$60 18 /23$
$64 8 /13$

Validate

Solution:

(4) Part of tank filled in 1 minute

= 1 /84+1/56-1/70=13/840

∴Time required to fill the tank

=840/13=64 8/13

minutes

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