How many seconds does it take for a 56800 bps modem to transmit a 640×480

How many seconds does it take for a 56800 bps modem to transmit a 640×480 pixel color bitmap, assuming the color of each pixel is encoded in 3 bytes?

To solve this problem, you first need to determine the total number of pixels in this image.

Multiply 640 and 480 pixels between each other.

We get:

640 * 480 = 307200 pixels.

Determine the information volume of the image in bytes.

Since we know that one pixel is equal to 3 bytes, we get:

30720 * 3 = 921600 bytes.

We translate the volume of the image into bits.

Since 1 byte contains 8 bits, we get:

921600 * 8 = 7372800 bits.

We find the time of transfer of the image.

7372800/56800 = 130 seconds.

Answer:

It takes 130 seconds.