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If the body covers one-third distance at speed v1, next one third at speed v2 and last one third at speed v3, then average speed will be
(1) v1 v2+v2 v3+v3 v1v1+v2+v3
(3) v1v2v3v1 v2+v2 v3+v3 v1
(4) 3v1v2v3v1 v2+v2 v3+v3 v1
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