一道英语数学题
Awomanarrivesatthestationatthesametimeeveryday.Herhusbanddrivesfromhometothestationtopickherup.Theyalwaysarrivebackattheirhouseatthesametimeeveryday,drivingatthesamespeed.Onedayshearrivesatthestationonehourearlyandstartstowalkhome.Herhusbandmeetsheralongtheroadandtheyarrivehometogether.Theyarrivedhometenminutesearlierthanusual.Assumingallspeedsofwalkinganddrivingareconstantandalltransfersareimmediate,howlonghadthewomanbeenwalkingwhenherhusbandmeether?()
(answerinminutes)
(A)10(B)50(C)55(D)70(E)90