A Boat Whose Velocity Through the Water Is 20 Km/h

Multiple Choice

A boat whose velocity through the water is 20 km/h is moving in a river whose current is 6 km/in relative to the riverbed. The velocity of the boat relative to the riverbed must be between

A) 6 and 20 km/h.
B) 6 and 26 km/h.
C) 12 and 20 km/h.
D) 12 and 26 km/h.