Postal or Sorting Assistants Model Paper 7 With Solutions

Question : 20 of 100

Marks: +1, -0

Two pipes 'A' and 'B' can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long are will it take to fill the tank ?

12 Min
15 Min
25 Min
50 Min

Validate

Solution:

(a) In one minute A can fill

[1/20]^{th}

Part
In one minute B can fill

[1/30]^{th}

Part
In one minute A and B together can fill

1/20+1/30=[1/12]^{th}

Parts
A and B together can fill the tank in 12 minutes

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