• [1439] Average Speed

  • 时间限制: 1000 ms 内存限制: 65535 K
  • 问题描述
  • You have bought a car in order to drive from Waterloo to a big city. The odometer on their car is broken, so you cannot measure distance. But the speedometer and cruise control both work, so the car can maintain a constant speed which can be adjusted from time to time in response to speed limits, traffic jams, and border queues. You have a stopwatch and note the elapsed time every time the speed changes. From time to time you wonder, "how far have I come?". To solve this problem you must write a program to run on your laptop computer in the passenger seat.
  • 输入
  • Standard input contains several lines of input: Each speed change is indicated by a line specifying the elapsed time since the beginning of the trip (hh:mm:ss), followed by the new speed in km/h. Each query is indicated by a line containing the elapsed time. At the outset of the trip the car is stationary. Elapsed times are given in non-decreasing order and there is at most one speed change at any given time.
  • 输出
  • For each query in standard input, you should print a line giving the time and the distance travelled, in the format below.
  • 样例输入
  • 00:00:01 100
    01:00:01 50
    03:00:05 140
  • 样例输出
  • 00:15:01 25.00 km
    00:30:01 50.00 km
    03:00:01 200.00 km
  • 提示
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  • 操作