KEAM 2011 Physics and Chemistry Paper

In a potentiometer experiment, when three cells A, B and C are connected in series thebalancing length is found to be 740 cm. If A and B are connected in series balancinglength is 440 cm and for B and C connected in series that is 540 cm. Then the emfof Ea,Eb‌and‌Ec are respectively (in volts)