一辆汽车以每小时50千米的速度,从相距80千米的甲地开往乙地.所带的汽油最多可以行2小时,在途中不加油的情况下,为保证返回出发地,最多开出（ ）千米,就应往回行驶了.
① 20 ② 40 ③ 50 ④ 100
人气：465 ℃ 时间：2019-09-09 17:37:11
解答
21302312 ,
③ 50
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