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A train covers a distance in 30 minutes. If it runs at a speed of 54 km/h on an average. The speed at which the train must run to reduce the time of the journey to 20 minutes is:
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Distance}} = 5a \times \frac{1}{2} = 27{\text{ km}} \cr
& {\text{Time}} = 20{\text{ min}} = \frac{1}{3}{\text{ hr}} \cr
& {\text{Speed}} = \frac{{27}}{{\frac{1}{3}}} = 81{\text{ km/hr}} \cr} $$
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