Pleasee help me pwease

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

What does si stand for,when referring to a system of measurement