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 : Choices:	A) 16 : 7	B) 15 : 7	C) 20 : 7	D) 7 : 15	E) 14 : 7

Rationale: explanation : dog : hare = ( 5 * 3 ) leaps of hare : 7 leaps of hare = 15 : 7 answer : b
Answer: B