A person covers a certain distance at a certain speed. If he covers one-third…
2020
A person covers a certain distance at a certain speed. If he covers one-third of the distance in three times the original time, then the ratio of this speed to the original speed is:
- A.
1:4
- B.
1:9
- C.
4:5
- D.
9:1
Attempted by 26 students.
Show answer & explanation
Correct answer: B
Let the original distance be D and the original time be T.
Original speed = D/T.
New distance = D/3 and new time = 3T.
New speed = (D/3)/(3T) = D/(9T).
Ratio of new speed to original speed = [D/(9T)] / [D/T] = 1/9 = 1:9.