Subject: mathqa
Question: a cat leaps 5 leaps for every 4 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: 4 : 8
B: 5 : 6
C: 3 : 2
D: 7 : 8
Answer: B