Can use speed instead of duration on tween

Cocos Creator
#1

hi
Is it possible to set speed instead of duration in tween ?

cc.tween(someNode)
.to("here set speed not duration " , {position : cc.vec3.ZERO})
.start()

like above code set speed instead of duration

#2

you can use this if you want use input speed
cc.tween(someNode)
.to(distance/speed, {position : cc.vec3.ZERO})
.start()

with speed is pixels/second

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