Subject: mathqa
Question: a cat leaps 6 leaps for every 5 leaps of a dog , but 2 leaps of the dog are equal to 3 leaps of the cat . what is the ratio of the speed of the cat to that of the dog ?
Option: 
A: 1 : 9
B: 4 : 5
C: 3 : 2
D: 2 : 3
Answer: B