A fast train covers a distance in 40 min , if it runs at a speed of 45 km/hr on an average , the speed at which the train must run to reduce the time of journey to 30 min will be?
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Answer:
15 kmph
Step-by-step explanation:
Time of the train = 40 min (Given)
Time = 40/60 hr = 2/3 hr
Speed of the train = 45 kmph (Given)
Distance = speed/Time
= 45 × 2/3
= 30 km
Time of journey = 30 mins
= 30/60 = 1/2 hr
Now, Speed = Distance/Time
= 30 × 1/2
= 15kmph.
Thus, the speed at which the train must run to reduce the time of journey to 30 min will be 15kmph.
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