The Greyhound couches leave a station every one and a half hours. If the first coach leaves at five o’clock in the morning, at what time does the fourth coach leave the station ?IKMC Grade 1 - 2
( Cứ 1 giờ 30 phút lại có một chuyến xe khách đường dài rời khỏi bến xe. Nếu chuyến xe khách đầu tiên rời khỏi bến lúc 5 giờ thì chuyến xe khách thứ tư sẽ rời bến lúc mấy giờ ? )
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