Use the usual formula: speed = distance / time
c = canoe speed; then boat speed = 2c
t = time by canoe; then t - 1/4 = time by boat
And distance by both = 3
Let's see what YOU can do
cindy and dave left the dock to canoe downstream. fifteen minutes later tammy left by motor boat with the supplies . since the motor boat travelled twice as fast as the canoe,it caught up with the canoe 3km from the dock. what was the speed of the motorboat