• 30 minute

  • 60 minute

  • 75 minute

  • 1 hour 30 minute


At a speed of 3/4 of the usual speed, the time taken is 4/3 of the usual time = (4/3 of usual time ) тАУ (usual time ) = 20min. тЗТ 4x/3 -x = 20 тЗТ x/3 =20 тЗТ x=60 min

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