标题: help : two old jijings... [打印本页] 作者: redhat 时间: 2002-11-1 14:16 标题: help : two old jijings...
1. A boy walkig along a road at 3 kilometers per hour is overtaken by a truck traveling at 40 kilometer per hour. If the truck breaks down 1 kilometer beyoud where it passes the boy, how many minutes agter the breakdown does the boy reach the truck?
ANS. 18.5 mins
2.If C is the temperature in degrees Celsius and F is the temperature on the two scales is expressed by the equation 9C=5(F-32). On a day when the temperature extremes recorded at a certain weather station differed by 45 degrees on the Fahrenheit scale, by how many degrees did the temperature extremes differ on the Celsius scale?
