Question

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1 .Rose‘s average speed for a 45 km journey was 75 km/h. she took 21 minutes for the first 2/3 of her journey. What was her speed for the last 1/3 of the journey?
2 Michale travelled 2/5 of his journey at 50 km/h. The next 1/5 of his journey he traveled at 40km/h. The remaining 40 km he covered in half an hour. How much time did he take for the whole journey?
3 A train departed Singapore st 10.40 a.m. and arrived in Malacca, 250 km away,at 2.00 p.m.. Along the way, it made 5 stops of 10 minutes each. Albert left Singapore in his car at the same time as the train and arrived in Malacca also at the same time but without stopping. How much faster was train｀s average
Speed compared to that of that of Albert｀s car?
4.A woman fell from the top of a building 280 metres tall.
3 seconds later, Superman jumped off the top of the same building to save her. It took Superman 2 seconds to rescue her just before she hit the ground. What was the total cost of the road?
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Answer 1

为一45千米去的旅程的1.Rose‘s平均速度是75千米／h。对于第一2/3的她的去的旅程的21分钟她发生作用。什么是她的为最后1/3的去的旅程的速度？2 Michale 在50千米他的去的旅程的2/5去旅行 h。他的去的旅程的下一个1/5他在40km/h去旅行。他使停留40千米处于半小时中的。他确实把视为整个去的旅程多少时间？在2.00下午一列火车3新加坡 st 10.40上午动身去和250千米离开到达马六甲。在过程中，10分钟的它每个制做5停止。阿尔贝同时但是不停止也在他的小汽车中作为火车把遗留在同样的时间新加坡和到达马六甲。更快把那个的 Albert‘s 小汽车的 train‘s 平均速度和那个比较的是多少？4.A妇女从一280米高建筑物的顶部跌落。以后3次品，超人跳过离开同样的建筑物的顶部从救出她。它2次品需要超人来从中救援她，就在她到了地之前。通向的道路的总成本是什么？