Task: Question Answering
Input (English): Problem: 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 :
Options: a. 16: 7, b. 15: 7, c. 20: 7, d. 7: 15, e. 14: 7
Output (English): b