self Maths Puzzle

two pipes A and B can fill the tank in 30 minutes and 45 minutes respectively.C can empty the tank in 60 minutes.When the tank is empty ,all the three pipes are opened together for 12 minutes and then pipe B is closed.how many minutes from the begining does it take for the tank to be filled?

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self Other Question

The expenditure and savings are in the ratio 4:1.if his savings is increased by 25% then what is the new ratio of his expenditure and savings? In a km race,A can B by 100m and B can beat C by 200m.By how many meters does A can beat C in the same race