Calculating fare based on a driving distance using webform

hi i am pradeep from india. i have opened a cab service. i just want to know about the fare calculator. i am using the wordpress. in that i am using the visual form builder. i want to add a google api. please tell me how to add the field with the script code... 

if the customer visits our website they will search for cabs by seeing the form

in that they will chose a origin city and the destination city. so that should be automatically seen and the kms should be calculated by it

can u pleae tell me

I would like to suggest trying a Driving Distance widget field on form. The widget will calculate an approximate driving distance based on Google Maps API.

The driving distance can be also used in combination with custom calculations.

Demo form: 

https://form.jotform.com/71264317151954

However, you will not be able to adjust the code of the Driving Distance widget. If the widget is not flexible enough, you might consider getting a form source code and host it with your custom code modifications on your website.

You can embed the form in Wordpress with the help of these guides:

Adding-Forms-to-Wordpress-org-Version
How-to-embed-a-form-to-Wordpress-com

If that doesn't work, please use the iFrame method. Here's how: Getting-the-form-iFrame-code.

The Form Calculation widget doesn't dictate any currency, it is giving a value. As you can see on the formula provided by Mike, it shows ($ DrivingDistance * 3).

"DrivingDistance" = distance between 2 locations (KM, M etc.)

"3" = price per distance (KM, M etc.).

You can change the value of "3" to you preferred amount. After that, you can just replace "$" with "Indian Rupee symbol".

Please check this guide for more information about Form Calculation: How-to-Perform-Form-Calculation-Using-a-Widget.

Hope that helps. Thank you.