標題:
請幫忙計算列式(最緊要列式)
發問:
1) Mrs chan walks at 0.9 m/s How long will it take her to walk 54 m and back?2) Two cars are approaching each othe from two places Town A and TownB 350km apart, at 65 km/h and 75km/h respectively. a. How long will it take them to meet?b. How far from Town B will their meeting place be?3) In a race Car A... 顯示更多 1) Mrs chan walks at 0.9 m/s How long will it take her to walk 54 m and back? 2) Two cars are approaching each othe from two places Town A and TownB 350km apart, at 65 km/h and 75km/h respectively. a. How long will it take them to meet? b. How far from Town B will their meeting place be? 3) In a race Car A and Car B were driing at 100 km/h and 80 km/h respectively . Car B started 1 h earlier. How long will it take A to overtake B?
最佳解答:
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1) The time taken for Mrs Chan to walk 54m and back = (54 *2) / (0.9) = (108) * (10 / 9) = 12 * 10 = 120 s 2a) The time taken for them to meet = (350) / (65 + 75) = (350) / (140) = (5/2) hours (或者 2.5 hours) 2b) The distance between Town B and their meeting place = (2.5)(75) = (375/2) km (或者 187.5 km) (我唔肯定2b...係TownB出發個架既車速係 65km/h 定係 75km/h? 應該係車速 75km/h 個架 以上既列式假設左係 車速75km/h 個架 以防萬一，如果係車速 65km/h 個架，則如下) 2b) The distance between Town B and their meeting place = (2.5)(65) = (325/2) km (或者 162.5 km) 3) The distance between Car A and B when Car A starts = (80) * (1) = 80 km The rate of shortening of the distance between Car A and Car B = 100 - 80 = 20 km/h The time taken for Car A to overtake B = (80/20) = 4 hours
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