Can't find the correct voltage and current source
Put some currents on the circuit: -







simulate this circuit &ndash; Schematic created using CircuitLab

Then recognize that where the 10 amps is flowing is at the potential V/2. This leads to: -

10 amps = \$\dfrac{\frac{V}{2}}{4\Omega} - \dfrac{\frac{V}{2}}{12\Omega}\$

10 amps = \$\dfrac{3V - 1V}{24\Omega}\$

10 amps = \$\dfrac{V}{12\Omega}\$ which means V = 120 volts

Can you take it from there given that each resistor has 60 volts across it.