A aeroplane travels at a speed of 846km/h.
(1) Express the speed of the aeroplane in m/s.
(2) How long does it take for the aeroplane to travel 1410km?
help help me，唔該!
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2007-10-24 6:28 am
回答 (4)
2007-10-24 6:53 am
1km=1000m & 1hr=3600s
1)846x1000 / 60*60
=235m/s
求時間=距離 除 速率
2)1410 / 846
=1.666666667hr
1)846x1000 / 60*60
=235m/s
求時間=距離 除 速率
2)1410 / 846
=1.666666667hr
2007-10-24 6:42 am
1km=1000m,1h=3600s
846x1000/3600=235m/s
1410/846=1.666666.........
so it take 1.6666666........h.
846x1000/3600=235m/s
1410/846=1.666666.........
so it take 1.6666666........h.
2007-10-24 6:35 am
(1)846/3.6 =235m/s
(2)1410km=1410000m
1410000/235=6000s
6000s=100mins
100mins=1hour and 40mins
2007-10-23 22:41:43 補充：
解釋第一題 1km=1000m 1hour=60mins 1mins=60s so1hour=60x60=3600skm轉m 要乘1000 h轉s 要除3600so km轉m and h轉s =1000/3600 =1/3.6so以後見到km/h轉m/s...除3.6就ok嫁啦
(2)1410km=1410000m
1410000/235=6000s
6000s=100mins
100mins=1hour and 40mins
2007-10-23 22:41:43 補充：
解釋第一題 1km=1000m 1hour=60mins 1mins=60s so1hour=60x60=3600skm轉m 要乘1000 h轉s 要除3600so km轉m and h轉s =1000/3600 =1/3.6so以後見到km/h轉m/s...除3.6就ok嫁啦
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