A dog takes 3 leaps for every 7 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 choice from the following choices:
A) 9 : 7  B) 9 : 9  C) 9 : 6  D) 9 : 1  E) 9 : 2

Rationale: "explanation : dog : hare = ( 3 * 3 ) leaps of hare : 7 leaps of hare = 9 : 7 . answer : a ) 9 : 7"
Answer: A