Hello there!

Explanation:
↓↓↓↓↓↓↓↓↓
First you had to do is switch sides of the equation.

Then you divide by t from both sides of the equation.

Simplify it should be the correct answer.

Answer⇒⇒⇒⇒⇒ r=d/t or t≠0
Hope this helps!
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-Charlie
SIR YOUR ANSWER IS B. I K FO SHO. THANK YOU. HOPE THIS HELPS. MIND MARKING BRAINLIEST AGAIN? XD THANKS
Answer:
<h2> 5mile per hour</h2>
Step-by-step explanation:
Step one:
given data
distance= 1/4mile
time taken= 1/20 hour
Step two:
Required
speed
we know that speed is
speed= distance/time
substituting
speed= 1/4/1/20
speed=1/4*20/1
speeed=20/4
speed=5mile/hour
The option a sis correct, the speed is 5mile per hour