Dan's velocity is miles per min at 7.5 minutes.At what other time is Dans velocity .25 miles per minute

I guess you mean he had some speed S at 7.5 min and forgot to type it

Did he start at zero speed at 0 time and accelerate constantly?
if so then
v = a t
at 7.5
S = 7.5 a
so a = S/7.5
at time t, v = .25
so
.25 = a t
or
.25= (S/7.5) t
so
t = 7.5 * .25 / S
that will be in minutes of course, multiply by 60 for seconds

correction

Dan's velocity is .25 miles per min at 7.5 minutes.At what other time is Dans velocity .25 miles per minute

Well I have no idea what sort of velocity versus time curve Dan is following.

To find the other time at which Dan's velocity is 0.25 miles per minute, we can use the formula:

Time = distance / velocity

Given that Dan's velocity is 1 mile per minute and the time is 7.5 minutes, we can substitute these values into the formula:

Time = 1 mile / 1 mile per minute = 7.5 minutes

Now we can find the other time using the same formula but with a different velocity:

Time = distance / velocity

Substituting in the values we know:

0.25 miles per minute = distance / velocity

We are trying to find the other time, so we can call it "x" minutes:

0.25 miles per minute = distance / x

To solve for "x", we need to find the distance traveled during this time. Since the velocity is constant, we can set up the equation:

1 mile per minute = distance / 7.5 minutes

Solving for distance:

distance = 1 mile per minute * 7.5 minutes = 7.5 miles

Now we can substitute the distance into the equation:

0.25 miles per minute = 7.5 miles / x

To find "x", we can rearrange the equation:

x = 7.5 miles / 0.25 miles per minute

Simplifying:

x = 30 minutes

Therefore, at 30 minutes, Dan's velocity will be 0.25 miles per minute.