You attend a concert and have a seat that is 70 m away from the stage where the sound is produced. How long does it take for the sound to reach your ears? You take a picture with your phone and send it to your friend who could not come to the concert. She lives in a town 45 miles away. How long does it take until she gets the picture on her phone? Please, include the assumptions that you make.

The concert: It'll take 0.1 to 0.5 second(s) for the sound to reach my ears.

The concert, Explanation: Why do I say this? It's because 70 m, let's just put it simple, is close or far, depending how you look at it. This might sound weird, but it explains how you look at it. Say this (( is the stage, and +++ are the chairs.

So you'd be like

(let's just say you are at the  end of those chairs ((and it's a straight line)), okay)?

The sound will come to your ears, but a bit delay. If you were in front, then it would come at the Start.

The picture: It'll take about 10+ seconds for her to get that picture.

The picture, Explanation: Why do I say this? It's because 45 miles, let's just put it simple, is very far. It takes this many minutes to go 45 miles with your car. Text messaging with your phone, or even emailing, will be slightly delayed. Say is the car's road and is the phone's internet to email or text your friend the picture.

So you'd be like

Friend's Phone, Message MADE IT!

Friend's House, I MADE IT!

That's why it would take a short delay to reach her phone for your friend to get that message.