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Solution

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Given, Speed $=50$ km/hr $=50/60=5/6$ km/min

Time taken by bus to cover distance $=48$ min

Distance$=speed×time=48×65 =40$ km

$∴$ Time it will take to cover $40$ km at $30$ km/h

= distance / speed $=40/30$ = $34 hrs=4×20$ min

= $80$ minutes.

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