—It's so late. Why not write the report tomorrow?—But I don't know _______ I can do it if not now.
撒 sā____ sǎ____
传 chuán____ zhuàn____
难 nàn____ nán____
已知A,B两地相距160km,一辆汽车从A地到B地的速度比原来提高了25%,结果比原来提前0.4h到达,这辆汽车原来的速度是____km/h.