# science

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Danny sails a boat downstream. The wind pushes the boat along at 21 km/hr. The current runs downstream at 15 km/hr. What is the actual velocity of the boat

• science -

Vb + Vc = 21 km/h,
Vc = 15 km/h,
Vb + 15 = 21,
Vb = 21 - 15 = 6 km/h = Velocity of boat.

• science -

36 km/hr, downstream

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