Quantitative Aptitude Speed Time and Distance Boat and River

A motor boat can travel at a speed of 10 km per hour in still water, it goes 36 km downstream in the river and returns the same. It took him a total of 20 hours. What is the speed of river flow?

1

3 km/h

2

5 km/h

3

8 km/h

4

9 km/h

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