Civil Services Examination · প্রশ্ন 39
A tram overtakes 2 persons X and Y walking at an average speed of 3 km/hr and 4 km/hr in the same direction and completely passes them in 8 seconds and 9 seconds respectively. What is the length of the tram?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) 20 m
ব্যাখ্যা
(v - 3) × 8 = (v - 4) × 9 gives v = 12 km/h. Length = 9 km/h × 8 s = 2.5 m/s × 8 = 20 m. (Answer as per the official UPSC answer key.)