Two shots are fired at a station 7 minutes 30 seconds apart. A passenger in a train moving away from the station hears them 8 minutes apart. If sound travels at 340 m/s, what is the train's speed?

Question

Accepted Answer

76.5 km/h. In the 8 minutes (480 s) between hearing them, the train moves 480v, which the second sound must also cover in the extra 30 s: 480v=340×30 → v=21.25 m/s =76.5 km/h. (21.25 is in m/s.)

Two shots are fired at a station 7 minutes 30 seconds apart. A passenger in a train moving away from the station hears them 8 minutes apart. If sound travels at 340 m/s, what is the train's speed?

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Problems on Trains practice