A train covers a distance in 30 min if it runs 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 min is:
Answer & explanation
Correct answer: option 2
Distance = Speed × Time
= 54 × \(\frac{30}{60}\)
= 27 km
Speed to cover 27km in 20 min.
Speed = \(\frac{Distance }{Time }\)
= \(\frac{27 × 60 }{20 }\)
= 81 km/h