Postal or Sorting Assistants Model Paper 4 With Solutions

Question : 10 of 100

Marks: +1, -0

A tap can fill an empty tank in 12 hours and a leakage can empty the whole tank in 20 hours. If the tap and the leakage are working simultaneously, how long will it take to fill the whole tank?

25 hours
40 hours
30 hours
35 hours

Validate

Solution:

=1/12-1/20={5-3}/60=1/30

Hence, the tank will be filled in 30 hours

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