- A63 km/h
- B66 km/h
- C57 km/h
- D60 km/h
Step-by-Step Solution
21 poles mark 20 gaps m in one minute → 60 km/h. (63 km/h counts 21 gaps.)
Answer: D) 60 km/h
Telegraph poles along a line are 50 m apart. A passenger counts 21 poles going past in one minute, the first at the start and the last at the end of the minute. What is the train's speed?
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