[单选题]
On a calm day (no wind), you can run a 1500-m race at a veloh4vd9 wa30f jg6ifpyz 3fad27city oflh-isp+( *ye0iz :eh f 4.0 m/s. If you ran the same race on a day when you had a constant headwind which slows your speed by 2.0 m/s, the tihpyhei0(s +- ie:z f*lme it would take you to finish would be
