A dog takes 3 leaps for every 5 leaps of a hare. If one leap of the dog is equal to 3 leaps of the hare, the ratio of the speed of the dog to that of the hare is : Choose the correct answer.
A) 9 : 5
B) 2 : 3
C) 4 : 7
D) 5 : 6
E) none of these

Rationale: "explanation : dog : hare = ( 3 * 3 ) leaps of hare : 5 leaps of hare = 9 : 5 . answer : a"
Answer: A