A dog takes 3 leaps for every 5 leaps of a deer. If one leap of the dog is equal to 3 leaps of the deer, the ratio of the dog's speed to the deer's speed is:
A
4 : 5
B
9 : 5
C
8 : 5
D
9 : 2
Correct Option:
B
Explanation
In the same time, the dog makes 3 leaps while the deer makes 5. One dog leap = 3 deer leaps, so the dog's distance = 3 × 3 = 9 deer-leap units, versus the deer's distance = 5. Speed ratio = 9:5.
