標題:
請幫忙計算列式(最緊要列式)
發問:
數學題理解請幫忙列式4. Two cyclists start off at the same time from the same place in two opposite directions at 45 km/h and 51 km/h. How long will it take if they are 288 km apart?5. Mary and John start walking from the same place the same time but in the opposite directions at 2 m/s and 2.5 m/s respectively. How far... 顯示更多 數學題理解請幫忙列式 4. Two cyclists start off at the same time from the same place in two opposite directions at 45 km/h and 51 km/h. How long will it take if they are 288 km apart? 5. Mary and John start walking from the same place the same time but in the opposite directions at 2 m/s and 2.5 m/s respectively. How far away will they be after 4 s? 6. Car A and Car B had a race. Car A was going at 64 km/h while car B at 56 km/h. Car B started one hour earlier. How long will it take Car A to overtake Car B?
最佳解答:
4. they will take: 288/(45+51) [distance/speed = time] = 3 hours 5. they will be far away each other after 4s: (2+2.5) x 4 = 18m [speed x time = distance] 6. Car A will overtake Car B 56/(64-56) [because car B drived 56km before car A start; their speed different is 64-56, distance/speed = time) = 7 hours
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其他解答:
4. 288/(45+51) = 3 Ans: 3 hours 5. (2+2.5) x 4 = 18 Ans: 18m 6. (56 x 1)/(64-56) = 7 Ans: 7 hours 開始時相距/每小時追近之距離
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