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Python Programs - Operators and Expressions

Calculate speed = distance/time and convert units - Python Program

Example 1 :

Python 

distance_km = float(input("Enter distance (km): "))
time_hr = float(input("Enter time (hr): "))

speed_kmph = distance_km / time_hr
speed_mps = (distance_km * 1000) / (time_hr * 3600)

print(f"Speed = {speed_kmph:.2f} km/h")
print(f"Speed = {speed_mps:.2f} m/s")

Output

 
OUTPUT  :
Enter distance (km): 120
Enter time (hr): 2
Speed = 60.00 km/h
Speed = 16.67 m/s

Example 2 :

Python 

def calculate_speed(distance, time, distance_unit, time_unit):
    """
    Calculates speed and allows for unit conversions.

    Args:
        distance (float): The distance traveled.
        time (float): The time taken.
        distance_unit (str): The unit of distance (e.g., 'km', 'miles', 'm').
        time_unit (str): The unit of time (e.g., 'hours', 'minutes', 'seconds').

    Returns:
        tuple: A tuple containing the calculated speed and its unit (e.g., (50.0, 'km/h')).
    """

    # Convert distance to a common base unit (meters for consistency)
    if distance_unit.lower() == 'km':
        distance_meters = distance * 1000
    elif distance_unit.lower() == 'miles':
        distance_meters = distance * 1609.34
    elif distance_unit.lower() == 'm':
        distance_meters = distance
    else:
        return None, "Unsupported distance unit."

    # Convert time to a common base unit (seconds for consistency)
    if time_unit.lower() == 'hours':
        time_seconds = time * 3600
    elif time_unit.lower() == 'minutes':
        time_seconds = time * 60
    elif time_unit.lower() == 'seconds':
        time_seconds = time
    else:
        return None, "Unsupported time unit."

    if time_seconds == 0:
        return None, "Time cannot be zero."

    speed_mps = distance_meters / time_seconds  # Speed in meters per second

    # Convert speed to desired output unit (e.g., km/h, mph)
    output_speed_unit = f"{distance_unit.lower()}/{time_unit.lower()}"
    if distance_unit.lower() == 'km' and time_unit.lower() == 'hours':
        speed_output = speed_mps * 3.6  # Convert m/s to km/h
    elif distance_unit.lower() == 'miles' and time_unit.lower() == 'hours':
        speed_output = speed_mps * 2.23694  # Convert m/s to mph
    else:
        speed_output = speed_mps # Default to m/s if no specific conversion defined

    return speed_output, output_speed_unit

# User input
try:
    distance_input = float(input("Enter the distance: "))
    distance_unit_input = input("Enter the distance unit (km, miles, m): ")
    time_input = float(input("Enter the time: "))
    time_unit_input = input("Enter the time unit (hours, minutes, seconds): ")

    speed, unit = calculate_speed(distance_input, time_input, distance_unit_input, time_unit_input)

    if speed is not None:
        print(f"\nThe calculated speed is: {speed:.2f} {unit}")
    else:
        print(f"\nError: {unit}")

except ValueError:
    print("\nInvalid input. Please enter numeric values for distance and time.")

Output

 
OUTPUT 1 :
Enter the distance: 120
Enter the distance unit (km, miles, m): km
Enter the time: 245
Enter the time unit (hours, minutes, seconds): hours

The calculated speed is: 0.49 km/hours

OUTPUT 2 :
Enter the distance: 120
Enter the distance unit (km, miles, m): m
Enter the time: 60
Enter the time unit (hours, minutes, seconds): seconds

The calculated speed is: 2.00 m/seconds
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