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Solution

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As we know that

$speed=timedistance $

Time taken by the car t travel $160km$ when travelling with the speed of $40km/hr=40160 =4$ hour

Time taken by the car t travel $120km$ when travelling with the speed of $60km/hr=60120 =2$ hour

Now,

Total distance travelled by the car $=160+120=280km$

Total time taken $=4+2=6$ hours

Therefore,

Average speed $=total timeTotal distance =6280 =46.67km/hr$

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