Q. 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 :
Answer: $latex 2\frac{5}{8}\ hours&s=1$
Notes: Speed of train = 60 km/hr Time $latex = 210\ minutes = \frac{210}{60} = \frac{7}{2}\ hours&s=1$ Distance covered $latex = 60\times \frac{7}{2} = 210\ km&s=1$ Time taken at 80 km/hr $latex = \frac{210}{80} = \frac{21}{8} = 2\frac{5}{8}\ hours&s=1$ Hence option [B] is correct answer.

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