Saved Bookmarks
| 1. |
A boat covers 48 km downstream in 20 h. What is the speed of the boat if it takes 4 h more to cover the same distance against the stream?1. 4.4 km/hr2. 2 km/hr3. 3.4 km/hr4. 2.2 km/hr5. 4 km/hr |
|
Answer» Correct Answer - Option 4 : 2.2 km/hr Given: Distance = 48 km Downstream Time = 20 h Upstream Time = 4 hrs more than Downstream Formula Used: Speed of boat in still water = ½ (Speed Downstream + Speed of Upstream) Calculations: Speed of Downstream = 48/20 = 2.4 km/h Speed of Upstream = 48/24 = 2 km/h ∴ Speed of boat in still water = ½ (Speed Downstream + Speed of Upstream) ⇒ (1/2) × (2.4 + 2) ⇒ (1/2) × 4.4 ⇒ 2.2 km/h The speed of the boat is 2.2 km/h. |
|