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The speed of a boat in still water is 9 km/hr and the speed of stream is 3 km/hr. The difference between the upstream speed and downstream speed will be:1. 6 km/hr2. 5 km/hr3. 3.5 km/hr4. 7.5 km/hr |
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Answer» Correct Answer - Option 1 : 6 km/hr Given: Speed of a boat in still water is 9 km/hr Speed of the stream is 3 km/hr. Concept Used: Upstream Speed = Speed of boat - Speed of stream Downstream Speed = Speed of boat + Speed of stream Calculation: Upstream Speed = Speed of boat - Speed of stream ⇒ Upstream Speed = 9 - 3 ⇒ Upstream Speed = 6 km/hr Downstream Speed = Speed of boat + Speed of stream ⇒ Downstream Speed = 9 + 3 ⇒ Downstream Speed = 12 km/hr Difference between the upstream speed and downstream speed ⇒ 12 - 6 ⇒ 6 km/hr ∴ Difference between the upstream speed and downstream speed is 6km/hr. |
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