# What is the distance of the destination from the starting place in kms?

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A man goes down stream with a boat to some destination and returns upstream to his original place in 15 hours.
If the speed of the boat in still water and downstream are 10 km/hr and 14 km/hr respectively.
What is the distance of the destination from the starting place in kms?

posted Aug 28, 2018

63 km

Lets say the distance is x km
Speed of the boat downstream is 14 km/hr
Speed of water flow is 14-10=4 km/hr
Speed of the boat upstream is 10-4=6 km/hr
Total time is:
x/14+x/6=15
x=63 km

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