RRB NTPC Prelims Model Paper 5 with solutions

Question : 16 of 100

Marks: +1, -0

A pipe can fill a cistern in 12 hours and another pipe can empty completely filled cistern in 18 hours. If both the pipes are opened together, the cistern will be filled in –

30 hours
36 hours
40 hours
44 hours

Validate

Solution:

(2) Total time taken to full the

pond =1/[1/12-1/18]hours

=1/{[3-2/36]}hours = 36 hours.

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