By Poonam

Verified by Ajay Kumar

Train 'P' can cross a pole in 8 seconds, while train 'Q' takes 15 seconds to cross train 'P' when they travel in opposite directions on parallel tracks. If the ratio of length of train 'P' to train 'Q' is 2:3 and the speed of train 'P' is 54 km/h, then find the speed (in km/h) of train 'Q'.

  1. 28 km/h

  2. 12 km/h

  3. 22 km/h

  4. 18 km/h

Answer: D

Solution

Speed of P = \(54 \times 5/18=15\) m/s. Length of P = \(15 \times 8=120\) m. Length of Q = \(120 \times 3/2=180\) m. Relative speed = \((120+180)/15=20\) m/s. Speed of Q = \(20-15=5\) m/s = \(5 \times 18/5=18\) km/h.

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