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6 hours

Explanation:

It took him 5 hours to travel from Johannesburg to Durban at a speed of 120km/h. If he is travelling at 100km/h then he will will take more than 5 hours, since he is moving at a slower speed.

$\dfrac{120}{100}\times 5 = 6$

$\therefore$ he takes 6 hours when moving at 100km/h

by Platinum (131,394 points)

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