A boat can cover 25 km upstream and 42 km downstream together in 7 hours. Also it can cover 30 km upstream and 63 km downstream together in 9 hours. What is the speed of the boat in still water?
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In 1st case,
Total diatance covered in going upstream and downstream is (25+42)km
=67km =67000m
Time taken=7 h=7❌3600 s
= 25200 s
Distance covered in 1s i.e speed,v=67000/25200
=2.65 m/s.
In 2nd case,
Total distance=30+63=93km
93000m
Time,t=9h= 32400 s.
Distance in 1s i.e speed ,v=93000/32400
=2.87m/s
Speed of boat still in water is between 2.9m/s and 2.7m/s.
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