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15 October, 17:16

a lumbar truck travels 60 miles each way from a sawmill to a lumber camp and then back in 7 hours. if the truck averages 5mph less on the return trip than on the trip to the camp, find its average speed to the camp

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  1. 15 October, 17:28
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    13.6 mph

    Step-by-step explanation:

    The truck travels 60 miles to and back. We know the truck took 7 hours on the journey back of 60 miles. This means it's average speed over this time was 60/7 = 8.6 miles per hour.

    It averages 5mph less on its return trip. This means on the way to the camp it goes 5mph faster so 8.6+5=13.6 mph on its trip to the camp.
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