Cứ mỗi giờ thì xe ii lại gần xe i số km là:
`60-45=15`(km)
Nếu đi `1` giờ thì gần `15` km thì đi `2` giờ thì gần số km là:
`15-15=0`(km)
`=>` Sau khi đi 2 giờ thì xe ii đuổi kịp xe i.
Đ/S:2 giờ
Đáp án + Giải thích các bước giải:$\text{Sau mỗi giờ,xe ii gần xe i là:}$
$\text{60 - 45=15 (km/giờ)}$
$\text{Thời gian để xe ii đuổi kịp xe i là:}$
$\text{30 : 15=2 (giờ)}$
$\text{Đáp số:2 giờ}$
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