2020 · Q44
In covering certain distance, the average speeds of X and Y are in the ratio 4 : 5. If X takes 45 minutes more than Y to reach the destination, then what is the time taken by Y to reach the destination?
Elementary MathematicsTime, Speed and Distance
- A135 minutes
- B150 minutes
- C180 minutes
- D225 minutes
Explanation
For a fixed distance, time is inversely proportional to speed, so the time ratio is 5 : 4. The difference of one part equals 45 min, so the faster cyclist Y takes 4 × 45 = 180 min. 180 minutes is 3 hours.