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Sally travels by car from one city to another. She drives for 26.0 min at 74.0 km/h, 40.0 min at 31.0 km/h, and 14.0 min at 27.0 km/h, and she spends 12.0 min eating lunch and buying gas. (a) Determine the average speed for the trip. km/h

Sagot :

Ok so you convert minutes to hours and multiply by 74 which gives 32.1km and the same goes for the 40 min which is 40/60 hours
and multiply that by 31 which is 21.7 km and for the 14 min it’s 14/60 times 27 which is 6.3 adding up all the kilometers gives you 32.1+21.7+6.3 and then you add all the minutes 26+40+14+12 which is 92 divide that by 60 and you get 1.53 hours and the km are 60.1, 60.1/1.53 gives us 39.3km/h.
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