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Two piers, $A$ and $B$, are located on a river: $B$ is $1500m$ downstream from $A$ (Figure 1). Two friends must make round trips from pier $A$ to pier $B$ and return. One rows a boat at a How much time does it take the walker to make the round trip? constant speed of $4.00km/h$ relative to the water; the other Express your answer in minutes. walks on the shore at a constant speed of $4.00km/h$. The velocity of the river is $2.80km/h$ in the direction from $A$ to $B$. Part B Figure 1 of 1 How much time does it take the rower to make the round trip? Express your answer in minutes.

distance between A and B = 1500 m constant speed of boat = 4 km/hr velocity of river = 2.80 km/hr constant speed of the friend