What are the possible coordinates of point a?

well 0

Step-by-step explanation:

basically when a point lies on an axis,one of its coordinates must be zero,let's say point a-

if you look at how far the point is from the origin along the x-axis,the answer is zero,therefore the x-coordinate is zero,any point that lies on the y-axis has an x-coordinate of zero.

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.