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A train covers a certain distance in 50 minutes, if it runs at a speed of 48 km/hr on an average. The speed at which the train must run so that the time of journey becomes 40 minutes?
  • a)
    10 km/hr
  • b)
    20 km/hr
  • c)
    40 km/hr
  • d)
    60 km/hr
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A train covers a certain distance in 50 minutes, if it runs at a spee...
We are having time and speed given, so first we will calculate the distance. Then we can get a new speed for a given time and distance.
Time = 50/60 hr = 5/6 hr
Speed = 48 mph
Distance = S*T = 48 * 5/6 = 40 km
New time will be 40 minutes so,
Time = 40/60 hr = 2/3 hr
Now we know,
Speed = Distance/Time
New speed = 40*3/2 kmph = 60kmph
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A train covers a certain distance in 50 minutes, if it runs at a speed of 48 km/hr on an average. The speed at which the train must run so that the time of journey becomes 40 minutes?a)10 km/hrb)20 km/hrc)40 km/hrd)60 km/hrCorrect answer is option 'D'. Can you explain this answer?
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