# Speed of light (layman) [duplicate]

If two bodies are moving towards each other along a straight line at a speed of $0.6c$ ($c=$ speed of light) w.r.t an inertial observer, then w.r.t each body, the other body is moving faster than light ($1.2c$). If each frame of reference is equally valid, how can the two bodies explain the velocity of approach of the other? (since velocity is always relative and hence the body cannot assume that it has absolute velocity in space)

## marked as duplicate by DilithiumMatrix, John Rennie special-relativity StackExchange.ready(function() { if (StackExchange.options.isMobile) return; $('.dupe-hammer-message-hover:not(.hover-bound)').each(function() { var$hover = $(this).addClass('hover-bound'),$msg = $hover.siblings('.dupe-hammer-message');$hover.hover( function() { $hover.showInfoMessage('', { messageElement:$msg.clone().show(), transient: false, position: { my: 'bottom left', at: 'top center', offsetTop: -7 }, dismissable: false, relativeToBody: true }); }, function() { StackExchange.helpers.removeMessages(); } ); }); }); Dec 28 '16 at 6:29

$$s = {v+u \over 1+(vu/c^2)}$$