Answer:

b. 20 seconds
Explanation:
Let
be the distance in miles and
be the time in seconds and
be the speed in miles/sec
Formula for Distance is given as:

Given that:
Distance = 2 miles and
Time = 10 seconds
Putting the values in formula:

Answer a:
Putting the value of
back in the formula to find the direct variation equation for the relationship between time and distance:

Answer b:
Using the above formula and putting
:
