{"common":{"save":0,"post_id":"8911","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4859","post_id":"8911","mon_id":"1159414","chapter_id":"1159498","question":"<p>Trong 4 phút Nam b\u01a1i \u0111\u01b0\u1ee3c 384 m. V\u1eadn t\u1ed1c b\u01a1i c\u1ee7a Nam là<\/p>","options":["<strong>A.<\/strong> 1,6 km\/h.","<strong>B.<\/strong> 1,5 m\/s.","<strong>C.<\/strong> 1,6 m\/s.","<strong>D.<\/strong> 1,5 km\/h."],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 1,6 m\/s.<\/span><\/p><p>\u0110\u1ed5i: 4 phút = 240 giây.<\/p><p>V\u1eadn t\u1ed1c b\u01a1i c\u1ee7a Nam là:<\/p><p>384 : 240 = 1,6 (m\/s).<\/p>","type":"choose","extra_type":"shape2","time":"0","user_id":"131","test":"0","date":"2025-04-21 09:09:03","option_type":"txt","len":0},{"id":"4862","post_id":"8911","mon_id":"1159414","chapter_id":"1159498","question":"<p>M\u1ed9t \u0111oàn tàu \u0111i t\u1eeb ga A và \u0111\u1ebfn ga B cách nhau 200 km v\u1edbi v\u1eadn t\u1ed1c 160 km\/h. Th\u1eddi gian \u0111oàn tàu \u0111i t\u1eeb ga A \u0111\u1ebfn ga B là:<\/p>","options":["<strong>A.<\/strong> 1 gi\u1edd 10 phút.","<strong>B.<\/strong> 1 gi\u1edd 15 phút.","<strong>C.<\/strong> 1 gi\u1edd 5 phút.","<strong>D.<\/strong> 1 gi\u1edd 25 phút."],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 1 gi\u1edd 15 phút.<\/span><\/p><p>Th\u1eddi gian \u0111oàn tàu \u0111i t\u1eeb ga A \u0111\u1ebfn ga B là: <\/p><p>200 : 160 = 1,25 gi\u1edd = 1 gi\u1edd 15 phút.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-21 09:12:33","option_type":"txt","len":2},{"id":"4864","post_id":"8911","mon_id":"1159414","chapter_id":"1159498","question":"<p>M\u1ed9t con h\u1ed5 có th\u1ec3 ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c 63 km\/h. H\u1ecfi trong 15 phút, con h\u1ed5 có th\u1ec3 ch\u1ea1y bao nhiêu mét?<\/p>","options":["<strong>A.<\/strong> 1575 m.","<strong>B.<\/strong> 157,5 m.","<strong>C.<\/strong> 15,75 m.","<strong>D.<\/strong> 15 750 m."],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> 15 750 m.<\/span><\/p><p>\u0110\u1ed5i: 15 phút = 900 giây.<\/p><p>63 km\/h = (63 000 : 3600) m\/s = 17,5 m\/s.<\/p><p>Trong 15 phút con h\u1ed5 ch\u1ea1y \u0111\u01b0\u1ee3c s\u1ed1 mét là:<\/p><p>17,5 x 900 = 15 750 (m).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-21 09:17:38","option_type":"txt","len":1}]}