Answer
The speed of the second satellite is 7330 m/s.
Work Step by Step
Let $M$ be the mass of the planet.
We can write an expression for the speed of the first satellite.
$v_1 = \sqrt{\frac{G~M}{R_1}}$
We can write an expression for the speed of the second satellite.
$v_2 = \sqrt{\frac{G~M}{R_2}}$
We can divide $v_2$ by $v_1$.
$\frac{v_2}{v_1} = \sqrt{\frac{R_1}{R_2}}$
$v_2 = v_1~\sqrt{\frac{R_1}{R_2}}$
$v_2 = (4800~m/s)~\sqrt{\frac{7.00\times 10^7~m}{3.00\times 10^7~m}}$
$v_2 = 7330~m/s$
The speed of the second satellite is 7330 m/s.