If both robots will need to move at the same time, avoid using the timed
versions of the movement commands. For example, the following commands will not
allow the robots to move simultaneously:
robot1.forward(0.75, 1)
robot2. backward(0.75, 1)
The first robot will move forward for one second. After it stops moving, the second
robot will move backward for one second. To make the robots move at the same time,
the following commands must be used instead:
robot1.forward(0.75)
robot2.backward(0.75)
wait(1)
robot1.stop()
robot2.stop()