A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 meters apart, then at what speed is the train travelling?

A 60 kmph

B 55 kmph

C 63 kmph

D 57 kmph

Solution

Correct Answer: Option A

21 টি টেলিফোন পোস্টের মোট দূরত্ব =20×50
                                                       =1000 মি.
আবার,1 মিনিট =60 সেকেন্ড
অতএব ,ট্রেনের গতিবেগ =1000/60=50/3 m/s
                                      =50/3 × 18/5 =60 km/h

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