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. What will be the time loss in journey when a train moving with a velocity of 30km/hr had to slow down to15 km/hr due to repairs along the way and then

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A train moving with a velocity of 30km/hr had to slow down to15 km/hr due to repairs along the way and then after some time regains its original speed. If the distance covered during retardation be one km and that during acceleration be half km, the time lost in the journey is 1 min.

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