A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/hr, the time taken by it to cover the same distance is equal to :

[A]

[B]

[C]

[D]

Time = 12 minutes

Speed of train =

New speed = 50 – 5 = 45 km/hr

Hence option [C] is correct answer.