[9.1 km/hr] If the speed of boat in still water is 10 km/hr the speed of stream is 3 km/hr, the boat rows to a

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If the speed of boat in still water is 10 km/hr & the speed of stream is 3 km/hr, the boat rows to a place which is 50 km far & returns through the same path. What would be the average speed of boat during the journey?

9.1 km/hr

8.1 km/hr

7.1 km/hr

6.1 km/hr

Explanation:

Given Parameters :

Speed of boat in still water = x = 10 km/hr

Speed of stream = y = 3 km/hr

We have,

Average Speed=$\dfrac{\left(x^2-y^2\right)}{x}km/h$

=$\dfrac{\left(10^2-3^2\right)}{10}km/h$

=$\dfrac{\left(100-9\right)}{10}km/h$

=9.1km/hr

Additional Questions

If the speed of boat in still water is 20 km/hr & the speed of stream is 5 km/hr,then find Downstream speed and Upstream speed?	Answer
A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?	Answer
A boat takes 6 hours to cover 36 km downstream and 8 hours to cover 32 km upstream. Then the speed of the stream is?	Answer
For a motorboat that covers a certain distance downstream in 2 hours & returns in 3 hours, what would be its speed in still water if the speed of stream is 6 km/hr?	Answer
Consider a boat which moves at the speed of 6 km/hr. If the water runs at the speed of about 4 km/hr, then the boat requires 3 hours to reach a certain place and return. Calculate the distance between that place & boat's initial position.	Answer
Suppose that a person rows a boat in still water at the speed of 10 km/hr and the water runs at the speed of 4 km/hr. This person travels a certain distance & then returns. If it takes 4 hrs more for him to travel upstream than that of downstream then what will be the distance?	Answer
If the speed of boat in still water is 10 km/hr & the speed of stream is 3 km/hr, the boat rows to a place which is 50 km far & returns through the same path. What would be the average speed of boat during the journey?	Answer

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