self Maths Puzzle

5,14,31,56,89,__

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self Other Question

Three inlets A,B & C fills the tank and kept open any one at a time. B is twice efficient and is opened for double the time that of A and C is thrice efficient and opened for duration three times that of A. If the tank gets filled in 12 hours then what part of tank is filled by C ? Sachin Tendulkar while walking diametrically across a semicircular playground, takes 3 minutes less than if he had kept walking round the circular path from A to B. If she walks 60 metres a minute, What is diameter of the play ground ?
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