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Rico jogged 5/12 km,while John jogged 7/12 km.who jogged longer?by how many kilometer?

A.Rico jogged longer than John by 5/12 km.

B.John jogged longer than Rico by 2/12 or 1/6 km.

C.Rico jogged longer than John by 1/2 km.

D.John jogged longer than Rico by 1/2 km.