Give a quick stream of consciousness before answering the following question. A motorcyclist goes from Bombay to Delhi, a distance of 200 kms at an average of 50 kmph speed. Another man starts from Bombay by car 2 Â½ hours after the first, and reaches Delhi Â½ hour earlier. What is the ratio of the speed of the motorcycle and the car?
Options:
(A) 1:2
(B) 1:7
(C) 1:9
(D) 1:4
(E) 1:1

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
T = 200/50 = 4 h
T = 4 - 3 = 1
Time Ratio = 4:1
Speed Ratio = 1:4
The answer: (D).