a train goes forward at a speed of 1m/s for 20 seconds. Then it stops abd goes backward at a speed od 0.5 m/s for 4 seconds. After both movements are completed, how far is the train located from its starting point.(note: we are asking for the train's final location, not the distance that it traveled.)

Question

a train goes forward at a speed of 1m/s for 20 seconds.  Then it stops abd goes backward at a speed od 0.5 m/s for 4 seconds.  After both movements are completed, how far is the train located from its starting point.(note: we are asking for the train's final location, not the distance that it traveled.)