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A man travels the first part of his journey at 20 km/h and the next at 70 km/h, covering the entire journey at an average speed of 50 km/h. What is the ratio of the distance that he covered at 20 km/h to that he covered at 70 km/h?

4 : 21
3 : 22
1 : 4
3 : 5

Correct Answer: 4 : 21

Explanation:

x/20 + y/70 = (x + y)/50
⇒ (70x + 20y)/1400 = (x + y)/50
⇒ 42x = 8y
⇒ x/y = 4/21

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