The distance travelled by a person varies directly with the duration of the journey.  If the person travels 900 km in 15 hours, in how many hours will the person cover 1500 km?

25 hours

When speed is constant then distance is directly proportional to time.

Hence,

Speed in both case is same, therefore,

⇒ \(\frac{900}{15}\) = \(\frac{1500}{60}\)

⇒ T = \(\frac{1500}{60}\)

⇒ T = 25 hours