- A3240 m
- B1620 m
- C1530 m
- D1440 m
Step-by-Step Solution
In 9 s, sound plus train together cover twice the distance: → m. (1530 m ignores the train's movement.)
Answer: B) 1620 m
A train heading straight towards a hill at 72 km/h sounds its whistle and hears the echo 9 seconds later. Sound travels at 340 m/s. How far from the hill was the train when it whistled?
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