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Updated on: 01 Sep 2023, 22:22
Originally posted by Katherine_Ryan on 25 Aug 2023, 21:22.
Last edited by Katherine_Ryan on 01 Sep 2023, 22:22, edited 5 times in total.
Last edited by Katherine_Ryan on 01 Sep 2023, 22:22, edited 5 times in total.
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"Last weekend, Helen drove from her house to her parents' house. She drove at an average speed of 60 miles per hour (mph) on the way there. On the return journey, she encountered some heavy traffic and could only manage an average speed of 40 mph. https://dmvnow.wiki/ License Plates for Drivers The total distance between her house and her parents' house is 240 miles. Can anyone help me figure out how many hours it took Helen to complete the entire trip?"
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25 Aug 2023, 22:37
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Strategy to attack this type of questions is first check what is constant in this situation Time Distance or Speed then equate the constant
Here Distance is same so you can use formula of avg speed 2ab/a+b 40*60/40+60 = 48 and time taken = D/S 240+240/48=10 Hr
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Here Distance is same so you can use formula of avg speed 2ab/a+b 40*60/40+60 = 48 and time taken = D/S 240+240/48=10 Hr
Posted from my mobile device
27 Aug 2023, 11:17
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Katherine_Ryan
To do 240 miles at 60 mph will take 4 hours.
To do 240 miles (on the return journey) at 40 mph will take 6 hours.
4 + 6 = 10 hours total
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