Is instant messaging a form of synchronous communication

Hope this helps Synchronous messaging involves a client that waits for the server to respond to a message. Messages are able to flow in both directions, to and from. Essentially it means that synchronous messaging is a two way communication. i.e. Sender sends a message to receiver and receiver receives this message and gives reply to the sender. Sender will not send another message until get reply from receiver that's the definition of synchronous

Each mile is 1.60934 kilometer,so 10 miles are 1.60934x10=16.0934 kilometers;