A train covers a certain distance in 210 minutes at a speed of 60 km/hr. The time taken by the train, to covers the same distance at a speed of 80 km/hr is :
[A] $3\frac{5}{8}\ hours$
[B] $2\frac{5}{8}\ hours$
[C] $4\frac{5}{8}\ hours$
[D] $3\ hours$