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### Question

Speeds of A and B are in the ratio 7 : 19. What is the ratio of the times that they will take to cover a distance of 100 km?

**A**

19 : 7.

**B**

7 : 19.

**C**

19 : 100.

**D**

100 : 7.

**Soln.**

**Ans: a**

Let the speeds be 7x and 19x. The times they take to cover 100 km are $100/{7x}$ and $100/{19x}$. The ratio would be 19 : 7.