Ali drove from Town A to Town B at an average speed of 60 km/h.

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• Ali drove from Town A to Town B at an average speed of 60 km/h.
• Ali drove from Town A to Town B at an average speed of 60 km/h.
• 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 A2.On a map,a length of 2cm represents an actual dista
• A train departed from city A to town B 180 km away at 9 in the morning.Tomarrived to the railway station late,therefore he went from A to B by car.He arrived atB at the same time as the train.The average speed of the car was 40 km/hours morethan the average speed of the train.When started Tom from
• 已知k＞0，函数f(x)＝x3−3x+k，g(x)＝2kx−kx2+2 （1）若对任意x1，x2∈[-1，1]都有f（x1）≥g（x2），求k的取值范围； （2）若存在x1，x2∈[-1，1]，使得f（x1）＜g（x2），求k的取值范围．
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