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Railways PYQCBT 2 2017

RRB NTPC · Question 48

Train P Starts from point A at 10 A. M and runs at a constant speed of 60kmph on a straight track and covers 360 km distance. Train Q starts from B at 11 AM and runs towards A at a constant speed. If it crosses P at a distance of 120 Km from B, then what is the speed of train Q ?

  1. 40 kmph

  2. 30 kmph

  3. 50 kmph

  4. 60 kmph

Show answer & explanation

Answer: (A) 40 kmph

Explanation

They meet 120 km from B, i.e. 360 − 120 = 240 km from A. Train P covers 240 km at 60 km/h in 4 hours, so they meet at 2 PM. Train Q, starting at 11 AM, covers 120 km in 3 hours, so its speed is 40 km/h.