(90×0.5+60×0.5)÷(90-60),
=(45+30)÷30,
=75÷30,
=2.5(小时),
(2.5-0.5)×90,
=2×90,
=180(千米).
答:正点到达需要2.5小时,A、B两地的路程是180千米.
故答案为:2.5,180.
(90×0.5+60×0.5)÷(90-60),
=(45+30)÷30,
=75÷30,
=2.5(小时),
(2.5-0.5)×90,
=2×90,
=180(千米).
答:正点到达需要2.5小时,A、B两地的路程是180千米.
故答案为:2.5,180.