gravitation Questions

The time period of a satellite of earth is $5\text{hours}$. If the separation between the earth and the satellite is increased to $4$ times the previous value, the new time period will become:

The escape velocity for a body projected vertically upwards from the surface of earth is $11\text{km/s}$. If the body is projected at an angle of $45^{\circ }$ with the vertical, the escape velocity will be:

Two spherical bodies of mass $M$ and $5M$ and radii $R$ and $2R$ respectively are released in free space with initial separation between their centres equal to $12R$. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is: