Multiple choice

A train 150 m. long crosses a stone in 15 seconds and crosses another train of the same length travelling in the opposite direction is 12 seconds. The speed of second train in km./hr. is - 150 मी. लम्बी एक रेलगाड़ी एक पत्थर को 15 सेकेण्ड में पार कर लेती है और विपरीत दिशा में चल रही उसी लम्बाई की एक अन्य रेलगाड़ी को 12 सेकेण्ड में पार कर लेती है, दूसरी रेलगाड़ी की चाल किमी/घंटा में है-

  1. 58

  2. 54

  3. 56

  4. 36
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B Correct answer
Explanation

First train's speed = 150/15 = 10 m/s. When trains cross in opposite directions, relative speed = sum of speeds. Relative speed = (150+150)/12 = 25 m/s. Second train's speed = 25 - 10 = 15 m/s = 15 × 18/5 = 54 km/h. Option A would require 16.11 m/s, option C would need 15.56 m/s, option D would need 10 m/s.

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