★ About "an electronic calculator of the speed"
Various calculations about the speed are possible.
The stopwatch is on, too.
Even if a share, a second, the speed use speed per hour, speed per minute, any unit of speed per second at time at km,m,cm, time, I can calculate the distance.
★ Main function
● Calculation for the distance
● Calculation for the time
● Calculation for the speed
● Calculation to convert a unit of speed
● Calculation to clear up a sentence title of the arithmetic
Arithmetical problem using the functional relations between speed, time and distance
I catch up with it after how many minutes or how many minutes do meet me after?
Applied test on transportation
The time when I hide in the tunnel at time to take to cross the iron bridge
A train passes the train that a train overtakes a different train
Velocity calculation
I make a round trip to / going down / going up the river
● Stopwatch