A train whose average speed is 54 km/h, covers a distance in 200 min. At what speed (in km/h) should it run to reduce the journey time to 90 min?

120

We know ,

Distance = Speed × Time

Distance is same, so

Let the speed beS km/hr

54 × \(\frac{200}{60}\) = S× \(\frac{90}{60}\)

S = \(\frac{54 × 200 }{90}\)

S = 120 km/hr

So speed is 120 km/hr.