Question:
The speed of a motor boat in still water is 7km/hr. If the speed of the motor boat against the stream is 5 km/hr, what is the speed of the stream?
The speed of a motor boat in still water is 7km/hr. If the speed of the motor boat against the stream is 5 km/hr, what is the speed of the stream?
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Remember, the speed of the boat in still water minus the speed against the stream gives you the speed of the stream.
Updated On: Apr 12, 2025
- \(1.5 \text{ km/hr}\)
- \(2 \text{ km/hr}\)
- \(2.5 \text{ km/hr}\)
- \(1 \text{ km/hr}\)
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The Correct Option is A
Solution and Explanation
Given:
- Speed of the boat in still water (\(u\)) = 7 km/hr
- Speed of the boat against the stream = 5 km/hr
The speed of the boat against the stream is calculated as:
u - v = 5 (km/hr)
Substitute the value of \( u \):
7 - v = 5
Solving for \( v \):
v = 7 - 5
v = 2 km/hr
Thus, the speed of the stream is 2 km/hr, which matches option (b).
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