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Which train takes the least time to pass a pole? P: 200 m at 72 km/h; Q: 150 m at 45 km/h; R: 240 m at 90 km/h; S: 180 m at 54 km/h.

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AP
BQ
CS
DR

Step-by-Step Solution

Times: P

= \frac{200}{20} = 10

s, Q

= \frac{150}{12.5} = 12

s, R

= \frac{240}{25} = 9.6

s, S

= \frac{180}{15} = 12

s. R is quickest.

Answer: D) R

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