Let the distance in kilometers be = d
Let the time in hours be = t
Distance traveled by albatross = 400 km
Time taken by albatross to cover 400 km = 8 hours
The given equation is :
d=50t
Here, 50 is the constant speed per hour at which the albatross is flying.\
speed =

so, speed =

The direct relation formula y= kx reads as y is directly proportional to x. And k is the constants of proportionality.
Here in d=50t, y is taken by variable d and x is taken by variable t and 'k' is 50.
Hence, constant of proportionality is 50. this is the speed which stays constant.
The variables of proportion are 'd' and 't' and relation between them is that they are directly proportional to each other.
If distance increases, time increases and if distance deceases, time decreases.