To determine the velocity of the bicycle in the west direction, we divide the displacement (140 miles) by the time taken (2 hours). Velocity is a vector quantity and includes both magnitude and direction.
Velocity = Displacement / Time
In this case, the displacement is 140 miles west, and the time taken is 2 hours. Dividing the displacement by the time, we get:
Velocity = 140 miles / 2 hours = 70 miles per hour (west)
Therefore, the velocity of the bicycle in the west direction is 70 miles per hour.