$[4/5$ Points$]$

An alien spaceship traveling at $0\mathrm{.}610$ c toward the Earth launches a landing craft. The landing craft travels in the same direction with a speed of $0\mathrm{.}810$ c relative to the mother ship $($as measured by aliens on the mother ship$).$ As measured on the Earth, the spaceship is $0\mathrm{.}300$ ly from the Earth when the landing craft is launched.

$($a$)$ What speed do the Earth$-$based observers measure for the approaching landing craft?

$q,$

$c$

$($b$)$ What is the distance to the Earth at the moment of the landing craft's launch as measured by the aliens $($mother ship$)?$

$$ ly

$($c$)$ What travel time is required for the landing craft to reach the Earth as measured by the aliens on the mother ship?

$q,$

Your response differs from the correct answer by more than $10\%.$ Double check your calculations. yr

$($d$*)$ What travel time is required for the landing craft to reach the Earth as measured by Earth$-$based observers?

yr

$($e$*)$ What travel time is required for the landing craft to reach the Earth as measured by those on the landing craft?

$q,-$ yr