Saved Bookmarks
| 1. |
Mr. Sunil covers his upward journey at 55 km/h and downward journey at 45 km/h. Find his average speed.1. 35.5 km/h2. 45.5 km/h3. 49.5 km/h4. 39.5 km/h |
|
Answer» Correct Answer - Option 3 : 49.5 km/h Given: Speed at upward journey = 55 km/h Speed at downward journey = 45 km/h Formula used: Average speed = Total distance/Total time Calculation: Let distance be 495 (LCM of 55 and 45) ⇒ (495 + 495)/[(495/55) + (495/45)] ⇒ 990/20 ⇒ 49.5 ∴ Average speed is 49.5 km/h |
|