A dog takes 5 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 answers:
A) 16 : 7
B) 15 : 7
C) 20 : 7
D) 7 :15
E) 14 : 7
Explanation:   Dog : Hare = (5*3) leaps of hare : 7 leaps of hare = 15 : 7   Answer: 15 : 7
<result>B</result>
A dog takes 5 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 :