If a boat goes 7km upstream in 42minutes and the speed of the stream is 3 km/hr, then the speed of the boat in still water is
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Distance travelled by boat upstream = 7 kms
Time taken = 42mins = 42/60 hrs = 7/10 hrs
Speed of boat upstream = Distance / Time
= 7 /( 7/10 ) km/hr
= 10km/hr
Speed of boat upstream = 10Kmph
Speed of stream is 3 Kmph (Given)
Therefore speed of boat in still water is 10+3 = 13Kmph.
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