Lightning flashes and you hear a thunderclap 4 seconds later. The velocity of sound is 340 m/s. How far away did the lightning strike?

1380 m

the distance traveled by the thunder is given as follows.s=vt; where, s is the distance traveled, v is the velocity of sound and t is the time taken. That is, 340 * 4 s = 1360 m.
distance the lightning occured is 1360 m.