Waves and their speed!
Did it ever occur to you?
We are trained not to ask questions and take things as they come.
Never we do think on things that do not disturb us!
You don't think that there is a body that is you, unless some part of it hurts you, the body!
After all, in a boat the waves generated move
ahead of the boat with a relative speed which is the normal
wave speed minus the speed of the pursuing boat. In a
similar way, the waves that are being left behind to the rear
should move away at a speed equal to the normal wave
speed plus the speed of the boat !!
Now think if the image is right?