9. The speed of a motor boat is that of the current of water as 36 : 5. The boat goes along with the current in 5 hours 10 min. It will come back in .
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Let the speed of the motor boat = 36 kmph and speed of current = 5x kmph.
The boat goes along with the current in 5 hours 10 minutes = 316
hour
Hence, Distance=316×(36x+5x)=41x+316kmSpeed of boat upstream=36x+5x=31xkmphHence, time taken to come back=41x×31631x=416hours=6hours50minutes
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