Answers

2015-12-13T13:37:54+05:30
Given 3/5 of a water tank is filled in 3min
Then the ratio is 3/5:3
The rest of the water in tank = 1- 3/5 = 2/5
Let the time taken to fill 2/5 of the water tank be x
Then the ratio is = 2/5:x
⇒3/5:3 = 2/5:x 
product of extremes = product of means
⇒(3/5)×x = 3×2/5
⇒3x/5 = 6/5
⇒15x = 30
⇒x = 30/15
∴x = 2
∴Time taken to fill 2/5 th of the water tank is 2minutes
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2015-12-13T15:10:26+05:30
3/5 th of tank is filled 
total space left to fill is 2/5 th
time taken to fill 3/5= 3 minute
time taken to fill  1/5 th = 1 minute
time taken to fill other 2/5th part= 2 minute
∴ so it will require 2 minutes to fill rest of the tank i.e. 2/5 th of the tank.
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