A race boat covers a distance of 60km downstream in one and half hour. It covers this distance upstream in 2 hours. The speed of boat in still water is 35km/h. Find the speed of the stream.
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Given; speed of boat in still water, B = 35 Km/h
Speed downstream, Sd = Distance/Time
Sd = 60 / 1.5
Sd = 20 / 0.5
Sd = 4 / 0.1
Sd = 40 Km/h
Speed upstream, Su = Distance/Time
Su = 60 / 2
Su = 30 Km/h
Sd = Speed of Boat in Still Water + Speed of Stream
Sd = B + S
B + S = 40
S = 40 - B
Substituting for B = 35
S = 40 - 35
S = 5 Km/h
Therefore, the speed of the stream is 5 Km/h
Speed downstream, Sd = Distance/Time
Sd = 60 / 1.5
Sd = 20 / 0.5
Sd = 4 / 0.1
Sd = 40 Km/h
Speed upstream, Su = Distance/Time
Su = 60 / 2
Su = 30 Km/h
Sd = Speed of Boat in Still Water + Speed of Stream
Sd = B + S
B + S = 40
S = 40 - B
Substituting for B = 35
S = 40 - 35
S = 5 Km/h
Therefore, the speed of the stream is 5 Km/h
Johannesberg:
Yeah Answer is correct.
Calculation for the Speed upstream can be omitted if you find it unnecessary : )
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