Answer:
Step-by-step explanation:
The slope of a perpendicular line is opposite and reciprocal to the original slope. Flip the fraction and change the sign, and you're all set!
V = -48
((-15 + v) / -3) = 21
(-15 + v) = -63
v = -63 + 15
v = -48
answer is in image attached
Answer
5 days and six hours or 126 hours