从水流速度和所用时间看船在静水中的速度

编写一个程序来确定小船在静水中的速度 (B)小时）。

例子：

Input : T1 = 4, T2 = 2, S = 5
Output : B = 15

Input : T1 = 6, T2 = 1, S = 7
Output : B = 9.8  

先决条件：上下游船速
可以使用以下公式计算静止水中的船速。
B = S*((T1 + T2) / (T1 – T2))

这个公式是如何工作的？
由于点是相同的，因此在上游行驶的距离应该与下游相同。
所以，
(B – S) * T1 = (B + S) * T2
B(T1 – T2) = S*(T1 + T2)
B = S*(T1 + T2)/(T1 – T2)

C++

// CPP program to find speed of boat in still water
// from speed of stream and times taken in downsteam
// and upstream
#include 
using namespace std;
 
// Function to calculate the speed of boat in still water
float still_water_speed(float S, float T1, float T2)
{
    return (S * (T1 + T2) / (T1 - T2));
}
 
int main()
{
    float S = 7, T1 = 6, T2 = 1;
    cout << "The speed of boat in still water = "<<
             still_water_speed(S, T1, T2)<<" km/ hr ";
    return 0;
}

Java

// Java program to find speed of boat in still water
// from speed of stream and times taken in downsteam
// and upstream
import java.io.*;
 
class GFG
{
    // Function to calculate the
    // speed of boat in still water
    static float still_water_speed(float S, float T1, float T2)
    {
        return (S * (T1 + T2) / (T1 - T2));
    }
 
    // Driver code
    public static void main (String[] args) {
        float S = 7, T1 = 6, T2 = 1;
        System.out.println("The speed of boat in still water = "+
                            still_water_speed(S, T1, T2)+" km/ hr ");
     
    }
}
 
// This code is contributed by vt_m.

Python3

# Python3 program to find speed of boat
# in still water from speed of stream and
# times taken in downsteam and upstream
 
# Function to calculate the
# speed of boat in still water
def still_water_speed(S, T1, T2):
    return (S * (T1 + T2) / (T1 - T2))
     
# Driver code
S = 7; T1 = 6; T2 = 1
print("The speed of boat in still water = ",
       still_water_speed(S, T1, T2), " km/ hr ")
        
# This code is contributed by Anant Agarwal.

C#

// C# program to find speed of boat
// in still water from speed of stream
// and times taken in downsteam
// and upstream
using System;
 
class GFG {
     
    // Function to calculate the
    // speed of boat in still water
    static float still_water_speed(float S, float T1,
                                            float T2)
    {
        return (S * (T1 + T2) / (T1 - T2));
    }
 
    // Driver code
    public static void Main()
    {
        float S = 7, T1 = 6, T2 = 1;
        Console.WriteLine("The speed of boat in still water = " +
                      still_water_speed(S, T1, T2) + " km/ hr ");
    }
}
 
// This code is contributed by vt_m.

Javascript

 
// Javascript program to find speed of
// boat in still water from speed
// of stream and times taken in
// downsteam and upstream
   
// Function to calculate the speed
// of boat in still water
function  still_water_speed(S, T1, T2)
{
    return (S * (T1 + T2) / (T1 - T2));
}
   
// Driver Code
var S = 7;
var T1 = 6;
var T2 = 1;
document.write("The speed of boat in still water = " +
               still_water_speed(S, T1, T2) + " km/hr ");
                
// This code is contributed by bunnyram19
 

输出：

The speed of boat in still water = 9.8 km/hr