Speed in m/s = $54 \times 5/18 = 15$ m/s. Time = Distance/Speed = $150 / 15 = 10$ seconds.
मीटर/सेकंड में गति = $54 \times 5/18 = 15$ मीटर/सेकंड। समय = दूरी/गति = $150 / 15 = 10$ सेकंड।