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Discussion

  1. On a journey across Delhi, a taxi average 30 kmph for 60% of the distance, 20 kmph for 20% of it and 10 kmph for the remainder, the average speed for the whole journey is ?
    1. 20 km/hr
    2. 22.5 km/hr
    3. 24.625 km/hr
    4. 25km/hr
  1. Correct Option: A

    Let total journey = y km
    Total time taken = time taken during 60% of distance + time taken during 20% of distance + time taken in remaining distance
    = [( 60y / 100 ) / 30] + [( 20y / 100 ) / 20] + [( 20y / 100 ) / 10]
    = ( y / 50 + y / 100 + y / 50 )hrs
    = y/20 hours.

    Average speed = total distance traveled / total time taken.
    = [y / ( y/20 )] km/hr
    =20 km/hr.


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