Tom is chasing Jerry. In the same interval of time Tom jumps 8 times while Jerry jumps 6 times. But the distance covered by Tom in 7 Jumps is equal to the distance covered by Jerry in 5 Jumps. The ratio of speed of Tom and Jerry is:

Answer: Option D

Given;
7 jumps of Tom = 5 jumps of Jerry
Or, $$\frac{\text{Tom}}{\text{Jerry}}=\frac{5}{7}$$
Let Jerry's 1 leap = 7 meter and Tom's 1 leap = 5 meter
Then, ratio of speed of Tom and Jerry
= $$\frac{8\times 5}{6\times 7}$$
= $$\frac{40}{42}$$
= 20 : 21