I am a beginner c++ programmer, I was wondering if somebody could help me get rid of this error

#include "stdafx.h"
#include<iostream>
using namespace std;
//declaration of function: convert miles  and time, into nautical miles,kilometer,meters,feet,calculat mile per hour,calculate kilometer per hour,calculate meter per second,calculate feet per second,calculate nautical mile per hour
//input: miles and time in minutes 
//output: nautical mile, kilometer, meter, feet, mile per hour,kilometer per hour,feet per second,nautical mile per hour, meter per second


float convert_miles_into_nautical_mile(float miles);
float convert_miles_into_kilometer(float miles);
float convert_miles_into_meter(float miles);
float convert_miles_into_feet(float miles);
float calculate_mile_per_hour(float minutes);
float calculate_kilometer_per_hour(float minutes);
float calculate_meter_per_second(float minutes);
float calculate_feet_per_second(float minutes);
float calculate_nautical_mile_per_hour(float minutes);


int _tmain(int argc, _TCHAR* argv[])
{

	
	//declaration
	float miles; float minutes; float nautical_mile; float kilometer; float meter; float feet; float mile_per_hour; float kilometer_per_hour; float meter_per_second; float feet_per_second; float nautical_mile_per_hour;
    
//Request miles
cout<<" Please insert miles\n";
cin>> miles;
// Request time in minutes
cout<<" Please insert time in minutes\n";
cin>> minutes;

nautical_mile = convert_miles_into_nautical_mile(miles);
cout<<"The conversion is"<<nautical_mile<<"nm"<<endl;

kilometer = convert_miles_into_kilometer(miles);
cout<<" The convesion is"<<kilometer<<"km"<<endl;

meter = convert_miles_into_meter(miles);
cout<<"The conversion is"<<meter<<"m"<<endl;

feet = convert_miles_into_feet(miles);
cout<<"The conversion is"<<"ft"<<endl;

mile_per_hour = calculate_mile_per_hour( minutes);
cout<<"The speed is"<<mile_per_hour<<"mph"<<endl;

kilometer_per_hour = calculate_kilometer_per_hour( minutes);
cout<<"The speed is"<<kilometer_per_hour<<"kmh"<<endl;

meter_per_second = calculate_meter_per_second( minutes);
cout<<"The speed is"<<meter_per_second<<"mps"<<endl;

feet_per_second = calculate_feet_per_second( minutes);
cout<<"The speed is"<<feet_per_second<<"fps"<<endl;

nautical_mile_per_hour = calculate_nautical_mile_per_hour( minutes);
cout<<"The speed is"<<nautical_mile_per_hour<<"nmph"<<endl;


return 0;
}
float  convert_miles_into_nautical_mile(float miles);

{                                                       located here at all the open brackets of my function
	float nautical_mile;
    nautical_mile = (miles * .8689762419006479);

	return (nautical_mile) ;
 }
float convert_miles_into_kilometer(float miles);
{
	float kilometer;
	kilometer= (miles * 1.609344);

	return (kilometer);
}
float convert_miles_into_meter(float miles);
{
	float meter;
	meter= (miles * 1609.344);

    return (meter);
}
float convert_miles_into_feet(float miles);
{
	float feet;
	feet= (miles * 5280);

	return (feet);
}
float calculate_mile_per_hour(float miles, float minutes);
{
	float mile_per_hour;
	miles_per_hour = (miles * 60)/minutes);

	return (mile per hour);
}
float calculate_kilometer_per_hour(float miles, float minutes);
{
	float kilometer_per_hour;
	kilometer_per_hour = (miles/minutes);
	return (kilometer_per_hour);
}
float calculate_meter_per_second(float miles, float minutes);
{
	float meter_per_second;
	meter_per_second = (miles * 1609.344)/minutes/60);
	return (meter_per_ second);
}
float calculate_feet_per_second(float miles, float minutes);
{
	float feet per second;
	feet per second = (miles /minutes/1.609);
	return (feet_per_second);
}
float calculate_nautical_mile_per_hour(float miles, float minutes);
{	
	float nautical mile per hour;
	nautical mile per hour = (miles * 60)/minutes);
	return (nautical_mile_per hour);
}

Could some body help me please
Thank you

The code is horrible. You still have a lot to learn.
But first:

float calculate_mile_per_hour(float miles, float minutes) //; there's no semicolon here!!!
{
float mile_per_hour;
miles_per_hour = (miles * 60)/minutes);

return (mile per hour);
}

I agree.. this is painful ..

To add to what Sci@phy told you, take a closer look at this

float calculate_mile_per_hour(float miles, float minutes);
{
float mile_per_hour;
miles_per_hour = (miles * 60)/minutes); 
return (mile per hour);
}

First of course, remove the semi-colon from all of your function definitions. Now, you declare your variable as mile_per_hour .. then on the next line you have miles_per_hour and you are trying to return mile per hour ... Your variable names ALL need to be exactly the same.. and you cannot have spaces in a variable name.

Read your code very carefully, and go through your compile errors and fix one line at a time. You need to read and understand your compile errors.

The code is horrible. You still have a lot to learn.
But first:

float calculate_mile_per_hour(float miles, float minutes) //; there's no semicolon here!!!
{
float mile_per_hour;
miles_per_hour = (miles * 60)/minutes);

return (mile per hour);
}

thank you

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