A student has created the give circuit diagram. It consists of a battery, a resistor, and a light bulb. In one minute, 1.2C of c
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Answer:
The speed of the river's current is 4.5 km/hr.
Step-by-step explanation:
Given : A fisherman traveled in a boat from point N upstream.
After having traveled 6 km, he stopped rowing and 2 hour 40 min after first leaving N, he was brought back to N by the current.
Knowing that the speed of the boat in still water is 9 km/hour
To find : The speed of the river’s current.
Solution :
Let the speed of current = x km/h
Speed of boat = 9 km/h
Thus, the speed in upstream = (9 - x) km/h
Also, the speed in downstream = x km/h (because the boat is stationary in downstream)
Total distance = 6 km ( from N to the point he reached )
Total time = 2 hours 40 minutes
We know,
According to the question,
Taking LCM and 6 common
Take 6 to another side,
Cross multiply,
Taking 4 common and cancel out
Solve quadratic equation by middle term split,
Therefore, The speed of the river's current is 4.5 km/hr.