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Verified answer
p = perahu, a = arus air
vp = 6 m/s
vp = 10 m/s
α = 60° → cos α = ½
t = 50 s
vpa = __?
S = __?
kecepatan perahu akibat pengaruh arus terhadap daratan
vp' = √(vp² + va² + 2 va vp cos α)
vp' = √(10² + 6² + 2•10•6•½)
vp' = √196 = 14 m/s ← jwb
jarak tempuh perahu
S = vp' t
S = 14 • 50
S = 700 m ← jwb