Jin Seng drove from town A at 09 15 hours and stopped along the way for lunch at 12 30 hours.He spent 45 minutes for lunch and drove for another 60 minutes to arrive at town B.The distance between town A and B is 900km. (a) Find his average spe

Jin Seng drove from town A at 09 15 hours and stopped along the way for lunch at 12 30 hours.He spent 45 minutes for lunch and drove for another 60 minutes to arrive at town B.The distance between town A and B is 900km. (a) Find his average spe
Jin Seng drove from town A at 09 15 hours and stopped along the way for lunch at 12 30 hours.He spent 45 minutes for lunch and drove for another 60 minutes to arrive at town B.The distance between town A and B is 900km.
       (a) Find his average speed in km/h
       (b) On his return journey,he drove on the same route continuously without stopping at 60km/h .How long will he take to arrive at town A
2.On a map,a length of 2cm represents an actual distance of 400 m.Calculate the
    (a) the actual distance,in kilometers,represented by 18cm
   (b) the area on the map,in square centimeters,given that the actual area is (2km square)

Jin Seng drove from town A at 09 15 hours and stopped along the way for lunch at 12 30 hours.He spent 45 minutes for lunch and drove for another 60 minutes to arrive at town B.The distance between town A and B is 900km. (a) Find his average spe
减掉他吃饭的45分钟他一共开了4小时15分钟,也就是4.25个小时.速度=路程除以时间,900除以4.25约等于211.76.所以答案是211.76km/h
时间=路程除以速度,900除以60=15.答案是15小时
地图上每2厘米就等于现实中400米,也就是说每1厘米等于200米.18乘200 是3600米,除以一千是3.6千米.答案是3.6km
现实中2000平方米,边长等于20倍根号5米,除以两百约等于0.22,也就是说再地图上是0.22厘米.0.22的平方是0.05.答案是0.05平方厘米
手机打字不容易.

(a) the average speed is equal to the full distance divided by the full time on the road.
the full distance is 900km; and the full time on the road is 12:30-09:15+0:60=4:15=4.25h
...

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(a) the average speed is equal to the full distance divided by the full time on the road.
the full distance is 900km; and the full time on the road is 12:30-09:15+0:60=4:15=4.25h
so his average speed is 900/4.25=211.76km/h
(b) the full time =The distance/ the speed=900/60=15h
2, 2cm means 400m
so (a) 18cm means 400/2*18=3600m
(b) 没有图，没法做
这就是简单的路程、时间、速度的计算题，能看懂英语就行

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1（a)不知道吃饭的时间算不算在平均速度内 算的话平均速度是900÷﹙12.5﹢0.75﹢1-9.25)=180km/h 不算的话是900÷(12.5﹢1-9.25)=211.765km/h
（b）900÷60=15huors
2(a)18÷2×400÷1000=3.6km
(b)2×1000000÷(400×400)×(2×2)=50cm square

at 09 15 hours ？？？这是？9：15走的？

(a)他一共开车开了4个小时零15分钟，也就是4又四分之一小时，平均速度V=900除以4又四分之一=211.8KM/H（小朋友千万别学）
b 900/60=15小时
2
a 2厘米表示400米，18厘米表示400X9=3.6KM
B 边长2千米的正方形，2千米在地图上就是5个2CM，也就是10cm 10X10=100平方厘米...

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(a)他一共开车开了4个小时零15分钟，也就是4又四分之一小时，平均速度V=900除以4又四分之一=211.8KM/H（小朋友千万别学）
b 900/60=15小时
2
a 2厘米表示400米，18厘米表示400X9=3.6KM
B 边长2千米的正方形，2千米在地图上就是5个2CM，也就是10cm 10X10=100平方厘米

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