A motorboat went down the river for 14 km and then up the river for 9 km. It took a total of 5 hours for the entire journey. Find the speed of the river flow if the speed of the boat in still water is 5 km/h.
A
1 kmph
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B
1.5 kmph
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C
2 kmph
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D
3 kmph
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Solution
The correct option is C 2 kmph 14SB+SS+9SB−SS=5145+SS+95−SS=5Using equation and going by option we getSS=2km/hr